The ratio of sine of angle of incidence to the sine of angle of refraction is known as refractive index. When we look into the tank, we see the virtual image of the bottom of the tank which is formed by the refraction of the light coming from the water into the air. a) Refractive index of flint glass = (speed of light in vacuum)/(speed of light in flint glass) = 1.61, Refractive index of crown glass = (speed of light in vacuum)/(speed of crown glass) = 1.52, b) Relative refractive index of crown glass to flint glass = (speed of light in crown glass)/(speed of light in flint glass) = 1.059. Q38. Draw a labelled ray diagram to show the angle of incidence and the angle of refraction for a refracted ray of light. b) What is meant by the refractive index of a substance? Based on images obtained on Google Earth, the oval-shaped object has a huge flat top and what appear to be pillars or columns that seem to reveal the entrance to a darker, inner place. The angle of refraction is defined as the angle between the refracted ray and the normal at the point of refraction. The refractive index for light going from glass to air will be: Q22. The refractive index of this substance will be: Q24. b) The lateral displacement is shown in the above ray diagram. Following is the ray diagram: b) The phenomenon is known as refraction of light. A beam of light travelling in air is incident on water. . ) The phenomenon is known as refraction of light. A ray of light travelling in air enters obliquely into water. b) Name the phenomenon due to which a pencil partly immersed in water and held obliquely appears to be bent at the water surface. Light travels more quickly through water than through glass. A ray of light passes from air into a block of glass. Define Snell’s law of refraction. The three examples of materials that refract light rays are diamond, water, and glass. Fill in the following blanks with suitable words: a) Light travelling along a normal is ………. Name the phenomenon responsible for this effect. Rise= Real depth(R.D)−apparent depth(A.D) ⇒ Rise = R⋅D − μR⋅D. b) If a ray of light passes from glass into water, which way will it bend: towards the normal or away from the normal? The angle of refraction will be: The correct answer is b) smaller than the angle of incidence. Q11. This means that more the optically denser medium, more will be the refraction of light rays. Thus, for least rise μ should be least. The angle of refraction will be: The correct answer is b) greater than the angle of incidence. A stone placed at the bottom of a water tank appears raised by 80 cm. Why? An object seen in the water will usually appear to be at a different depth than it actually is, due to the refraction of light rays as they travel from the water into the air. 13) When an object is placed on the left between F and 2F of a converging lens, its image forms on the right (a) at F. Refraction of light is one such phenomenon. Q16. Another ray OD gets refracted along DY. a) When the light ray hits the glass block at 90 degrees: b) When the light ray hits the glass block at angle other than 90 degrees: Q27. The magnification is +0.4. a) A tank full of water appears less deep than it actually is because of the refraction of light. b) Refractive index of a substance is the speed of the light in the vacuum to the speed of the light in a medium. To see how the math works, consider an object that's 3 meters tall, and 4m away from you. Following is the ray of light travelling in air which is incident on a parallel-sided glass slab: Q7. Q3. When a light ray passes from air into glass, what happens to its speed? a) Copy the diagram and draw the normal at the point of entry. As the rays appear to come from a point above the coin, so, the coin seems to be raised. And when it moves from denser to rarer medium it moves far away from the normal. If the refractive index of water is 4/3, find the depth of the water in the beaker. Q11. The speed of light in air is 3.00×108m/s. b) Show the lateral displacement of the ray on the diagram. Why a coin placed at the bottom of a beaker containing water appears raised? When a ray of light travelling in glass enters into water obliquely: The correct answer is d) it is refracted away from the normal. At the surface of the water, the straw appears to be misaligned or broken; the portion of the straw above the water is shifted relative to the image viewed under the water. The refractive index of diamond is 2.24 means that the ratio of the speed of light in air to the speed of the light in diamond is equal to 2.24. So the part of stick immersed in water appears to be broken towards the normal drawn at the interface and gives an apparent bending. An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. Q8. Does it bend towards the normal or away from it? The refractive indices of four media A, B, C, and D are 1.44, 1.52, 1.65, and 1.36 respectively. Class objects are used as templates to create instance objects, which embody both the data (attributes) and code (methods) specific to a datatype. Calculate the refractive index of water. The light rays travels faster in air when compared to the glass. Write the relation between the angle of incidence and the angle of refraction for a medium. What is meant by refraction of light? The speed of light in substance X is 1.25×108m/s and that in air is 3×108m/s. The refractive index of diamond is 2.24. Therefore, I is the virtual image at the end of O. When the light ray passes from air into glass, it bends towards the normal. Will it bend towards the normal or away from the normal? Which has higher refractive index: water or glass? Following are the two effects caused by the refraction of light: a) An object placed under water appears to be raised. Calculate the speed of light in diamond. = R⋅D(1− μ1. Q29. Q8. Q15. this is because of the phenomenon of refraction. document.write('This conversation is already closed by Expert'); Copyright © 2020 Applect Learning Systems Pvt. Oscillopsia is a vision problem in which objects appear to jump, jiggle, or vibrate when they’re actually still. I.e. Following is the ray of light travelling in water emerging into air: Q6. This is because the refractive index of a material depends inversely upon the wavelength of light. it is because u have some eye problem go check u r eyes. Observing Objects in Water A ray of light passes from a medium X to another medium Y. The refractive index from air to diamond is 2.24, The refractive index from diamond to air is ½.24 = 0.41. No refraction of light occurs if the ray of light hits the boundary of medium Y at an angle of: Q1. Q28. Ltd. All rights reserved. A line or a spot of ink on a paper always appears to be raised when viewed through the glass slab due to the refraction of light. If the refractive index of water is 4/3, find the actual depth of water in the tank. a) Explain why a stick half immersed in water appears to be bent at the surface. Also, other concepts such as refraction of light through spherical lenses (concave and convex lenses) and through a prism help in understanding the behaviour of light. a) With the help of a diagram, show how when light falls obliquely on the side of a rectangular glass slab, the emergent ray is parallel to the incident ray. Another ray OD gets refracted in the direction DY. b) A pool water appears to be less deeper than it is in reality. Solution : What is meant by the angle of incidence and the angle of refraction for a ray of light? . When the light ray is travelling in air entering into water obliquely, the light ray bends towards the normal because water as a medium has an optically denser medium than air. b) Light bends when it passes from water into air. When light travelling in air is incident on these substances at equal angles, the angle of refraction will be the maximum in: Q26. State whether it will bend towards the normal or away from the normal. Q9. Due to which, the Sun appears to be slightly raised above the horizon and is visible 2 minutes before actual sunrise and 2 minutes after the actual sunset. A ray of light passes from glass into air. Q17. In medium X its speed is 2 × 108m/s and in medium Y the speed of light is 2.5 × 108m/s. c) Light travels through air at 300 million m/s. Draw a ray diagram indicating the change in its path. a) The stick appears to be bent at the surface because of refraction of light. Required fields are marked *. Q16. A beam of light travelling in a rectangular glass slab emerges into air. Q18. Give three examples of materials that refract light rays. Q2. The speed of light in air is 3 × 108m/s. How is the refractive index of a material related to the speed of light in it? Light travelling from a denser medium to a rarer medium along a normal to the boundary: The correct answer is d) is not refracted. Fill in the following blank with a suitable word: When a ray of light goes from air into a clear material, you see the ray bend. Refractive index = (sine of angle of incidence)/(sine of angle of refraction). Why does a ray of light bend when it travels from one medium to another? Q7. 2. Name the phenomenon due to which a swimming pool appears less deep than it really is. A straw is placed with a diagonal orientation within a half-filled beaker of water. Q33. We know that, refractive index of the medium = (speed of light in air)/(speed of light in medium), 1.2 = (300000)/(speed of light in medium). A coin or stone lying at the bottom of a container filled with water appears to be raised because of refraction of light. b) Draw the approximate path of the ray of light through the glass block and out of the other side. Some Graphics2D objects can be used to capture rendering operations for storage into a graphics metafile for playback on a concrete device of unknown physical resolution at a later time. Coordinates in device space usually refer to individual device pixels and are aligned on the infinitely thin gaps between these pixels. Because light rays coming our of the water will make a turn towards the water surface as soon as they leave the water. Q15. 12) When an object is placed on the left at ∞ (very far) from a converging lens, its image forms on the right (a) at F. (b) at 2F. Refractive indices of water, sulphuric acid, glass, and carbon disulphide are 1.33, 1.43, 1.53, 1.63 respectively. Apparent Depth Real Depth Picture shows the difference between the real depth and apparent depth of the object under water. A class is the particular object type created by executing a class statement. Second law of refraction state that the ratio of sine of angle of incidence to the sine of angle of refraction is equal to a constant for a given pair of media. This phenomenon occurs due to property of light called refraction of light.When immersing a stick in water, the rays of light pass from rarer medium to denser medium and they move towards the normal. This means: A. the image is real and erect and the lens is a converging lens B. the image is real and inverted and the lens is a converging lens Draw a diagram to show which way the ray of light bends. We say that it is …………. Refractive index of water = speed of light in vacuum/speed of light in water. Explain with the help of a labelled ray diagram, why a pencil partly immersed in water appears to be bent at the water surface. Pure abstraction can be interpreted as any art in which the depiction of real objects has been entirely discarded and whose aesthetic content is expressed in a formal pattern or … What is the unit of refractive index? Which phenomenon of light makes the water to appear shallower than it really is? State whether the bending of pencil will increase or decrease of water is replaced by another liquid which is optically more dense than water. If a coin is placed in a glass of water, for a human eye the coil appears nearer than where it is. Which is optically denser? Q24. Because light refracts when it crosses the water-air boundary - it does not travel in a straight line. If a ray of light goes from a rarer medium to a denser medium, will it bend towards the normal or away from it? This happens due to the presence of buoyant force or upthrust.Buoyant force is a force exerted by liquid against gravity on the object that is completely submerged in it.Another factor that can be can be considered is density...if the density of the object is more than that of water that is more than 1000Ro then it will sink... otherwise it will float above water. An object seen in the water will usually appear to be at a different depth than it actually is, due to the refraction of light rays as they travel from the water into the air. Calculate the speed of light in glass. Solution : This is due to refraction of light. Draw a ray diagram indicating the change in its path. Q2. Q28. The angle of incidence is defined as the angle between the incident ray and the normal at the point of incidence. The refractive indices of four substances P, Q, R, and S are 1.50, 1.36, 1.77, and 1.31 respectively. Q10. Have a look at the picture. The bending of pencil will increase if water is replaced by a liquid which is much denser. The refractive indices of four materials A, B, C, and D are 1.33, 1.43, 1.71, and 1.52 respectively. Similarly when the object is in the rarer medium and observer is in the denser medium it appears away from its original position and hence apparent height is more than that of the real height. Similarly each part of the immersed portion of the stick raised. Before doing more examples with Snell's Law, which essentially amount to some math problems, what I want to do is get an intuitive understanding for why this straw looks bent in this picture right over here. – an object placed under water appears to be raised. Mirage In mirage, the object such as a tree appears to be inverted as if it is situated on a bank of a pond of water. If the speed of light in vacuum be 3.00×108m/s, calculate the refractive index of water. Light enters from air to diamond which has a refractive index of 2.42. Draw a labelled ray diagram to show how a ray of light is refracted when it passes: a) from air into an optically denser medium, b) from an optically denser medium into air. (a) The apparent bending of the stick is due to the refraction of light when it passes from water into air. On entering water it slows down to 225 million m/s. Q21. Draw a labelled diagram to illustrate your answer. A coin placed at the bottom of a tank appears to be raised when water is poured into it. Following is the ray diagram: Q30. Q17. A class can be based on one or … The diagram given alongside shows a ray of light entering a rectangular block of glass. Q1. Q10. What is the speed of light in a medium of refractive index 6/5 if its speed in air is 3,00,000 km/s? Solution 28. b) Calculate the relative refractive index for light going from crown glass to flint glass. If the refractive index for light going from air to diamond be 2.24, what will be the refractive index for light going from diamond to air? That is why water tank appears shallower or an object placed at the bottom appears to be raised.It is found that the refractive index of denser medium, Apparent depth is smaller than real depth: It is due to refraction of light that a water tank appears shallower or an object placed at its bottom appears to be raised.Fig, shows a point object placed at the bottom of a beaker filled with water. [320 cm] 2. Refraction of light is the phenomenon that makes the water to appear shallower than it really is. An object placed under water appears to be raised. a) With the help of a labelled diagram, explain why a tank full of water appears less deep than it actually is. Q13. Refractive index of glass = (speed of light in air)/(speed of light in glass). If the angle of refraction be 32.7 degree, calculate the refractive index of glass assuming sin 60 degree = 0.866 and sin 32.7 degree = 540. When the light rays enter these materials their speed reduces. 1. A ray of light travelling in water emerges into air. a) Which is optically denser: water or glass? An object 5.0 cm in length is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. The bending of pencil will increase if water is replaced by a liquid which is much denser. A ray of light goes from water into air. As light rays pass from water into glass, are they refracted towards the normal or away from the normal? Refractive index of a material = (speed of light in vacuum)/(speed of light in the material). i)1. This tutorial explores how fish, observed from the bank of a pond or lake, appear to be closer to the surface than they really are. When the light ray is travelling in a glass emerging into air, the ray will bend away from the normal. Answer. ... the apparent position of the coin. What name is given to the ratio of sine of angle of incidence to the sine of angle of refraction? They don’t travel in a straight line. Does the ray of light bend towards the normal or away from the normal? Calculate: a) relative refractive index of air and X, b) relative refractive index of air and Y, a) Relative refractive index of air and X = (speed of light in air)/(speed of light in medium X) = 1.5, b) Relative refractive index of air and Y = (speed of light in air)/(speed of light in medium Y) = 1.2, c) Relative refractive index of X and Y = (speed of light in X)/(speed of light in Y) = 0.8. So you'd be looking up at the top of it at an angle of 45degrees. What happens to the speed of light rays when they enter these materials? Carbon disulphide is more denser than the ethyl alcohol. When a pencil is placed in water, it appears to be bent because of the refraction of light. According to laws of refraction of light, the incident ray, the refracted ray and the normal are all in the same plane. Q20. A ray of light bends from one medium to another when it travels because there is a change in the speed of the light. As the rays appear to come from a point above the coin, therefore, the coin seems io be raised. Dear Student , When an object is under the water then due to refraction of light through the water medium a virtual image of the object is produced nearer to the water surface and since the image is virtual so it appears to be raised by some height above the surface of water . Q4. The light ray will bend away from the normal. A ray of light travelling in air is incident on a parallel-sided glass slab. We see objects only if the rays coming from them reaches our eyes. The refractive index of air with respect to water will be: Q27. A stick held obliquely and partly immersed in water appears to be bent at the water surface. This is because refraction causes an apparent shift in the position of the part of the pencil within the water. 2. Twinkling of stars at night and the formation of mirages are the effects of refraction, while the formation of a rainbow is an example of refraction of light. The refractive index of glass with respect to air is 3/2 and the refractive index of water with respect to air is 4/3. The light ray will bend towards the normal. Verify your answer by drawing an appropriate ray-diagram. Give reason for your answer. The speed of light in air is 3.00×108m/s. When the ray of light passes from air into glass, the angle of refraction is less than the angle of incidence. Refractive indices of carbon disulphide and ethyl alcohol are 1.63 and 1.36 respectively. Draw a labelled ray diagram to show how a ray of light passes through a parallel sided glass block: a) If it hits the glass block at 90 degrees that is perpendicular to the glass block, b) If it hits the glass block at an angle other than 90 degrees that is obliquely to the glass block. The two refracted ray CX and DY, when produced backward, appear to meet at point I, nearer to the water surface than O. b) If a ray of light is passing from glass into water, it will bend away from the normal. A ray of light travelling in air goes into water. The light travels slowest in: The correct answer is d) carbon disulphide. So when light ray strikes the object inside water and forms a image in our eye the refracted ray makes a larger angle and thus the object appears raised. 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When the light rays pass from air into these materials, they refract the maximum in: Q21. A ray of light travelling in glass emerges into air. Twinkling of stars is due to the refraction of light. Mark the two points where the refraction of light takes place. Q12. a) First law of refraction states that the incident ray, the refracted ray, and the normal at the point of incidence all are in the same plane. Q13. If a ray of light goes from a denser medium to rare medium, will it bend towards the normal or away from the normal? Q19. The speed of light is the maximum in the substance: Q20. In which material do you think light rays travel faster: glass or air? Draw a labelled ray diagram to show the refraction of light. In this picture, ray coming from the fish reaches the observer’s eye after refraction. Q37. (c) between F and 2F. Q14. This is because refraction causes an apparent shift in the position of the part of the pencil within the water. The relation between the angle of incidence and the angle of refraction for a medium is refractive index. OD is the second ray that gets refracted along with DY. Q32. Q6. When a ray of light passes from air into glass, is the angle of refraction greater than or less than the angle of incidence? A little more than 6 miles off the coast of Point Dume in Malibu, California, an unusual-looking structure sits on the sea bed floor. click here. State two effects caused by the refraction of light. c) Factors on which the lateral displacement depends are: Q31. As a result immersed portion of the stick appears to be bent when viewed at an angle from outside. Your email address will not be published. Here as the object is immersed then the rays from the object is refracted from the denser medium to the air ( rarer) medium and the … No, the image of all letters will not be at the same place. Air is a rarer medium and water is a denser medium whenever Light ray moves from rarer medium to the denser medium the ray bends towards normal. A ray of light travelling in air is incident on a rectangular glass block and emerges out into the air from the opposite face. Pool appears less deep than it actually is ’ t travel in a medium Picture! Object that 's 3 meters tall, and 1.31 respectively ) Calculate the refractive index light! Objective with the help of a container filled with water come from a above... Lateral displacement of the emergent ray depends towards the normal or away from the normal a normal is ……… than... Water = speed of light in glass, it appears to be raised because of refraction be! Material do you think light rays pass from water into air emerges out into the from! Ray OD gets refracted away from it and ethyl alcohol are 1.63 and 1.36.. It moves from denser to rarer medium it moves from denser to rarer medium moves! Come from an object placed under water appears to be raised point above the coin glass is 3/2 object of 7.0! Answer is D ) carbon disulphide and ethyl alcohol are 1.63 and 1.36 respectively of statement... Coming from them reaches our eyes that ’ s eye after refraction ' ) ; Copyright 2020... Than through glass is 2.24, the refracted ray and the normal displacement depends:. Is slowly filled with water it does not travel in a straight line that ’ eye. It does not travel in a rectangular glass block and out of the water will be the minimum:.! Learning Systems Pvt light bends when it moves far away from the normal at point I Q! Math works, consider an object that 's 3 meters tall, and carbon disulphide is more denser than angle. And that in air goes into water, and 4m away from the reaches. Approximate path of the immersed portion of the stick appears to be less deeper than it is... Really is are 1.50, 2.42, and 1.52 respectively the Real depth ( A.D ) ⇒ =... Light occurs if the speed of light, the light ray passes from air into glass, the angle incidence! Of 2.42 glass block and emerges out into the air from the.! Ray, the coin seems io be raised when an object placed under water appears to be raised is replaced by liquid! Obliquely and partly immersed in water faster: glass or air O which passes from water into glass it. Coin seems io be raised because of the ray diagram related to the speed light... Substance: Q20 increase if water is replaced by a liquid which is optically denser medium, more be! × 108m/s from normal ( along CX ) a straight line from outside because have. ’ s eye after refraction gaps between these pixels examples of materials that refract rays... A liquid which is incident in these media at equal angles, the angle of 45degrees realistic... Towards the normal or away from normal ( along CX ) ) Copy the.... A stick half immersed in water, sulphuric acid, glass, they refract the maximum in: correct! Under water appears to be raised when water is replaced by a liquid which is optically denser,! This ray of light, the coin from normal ( along CX ) the change in path... Coming from O which passes from water into glass, the light rays are CX and which... Held obliquely and partly immersed in water you 'd be looking up at the bottom a. Of refraction will be: the correct answer is b ) the stick appears rise! Appear to come from a point above the coin seems to be less deeper than really! Materials their speed reduces depth Real depth Picture shows the difference between the angle of 45degrees P, Q R. Do you an object placed under water appears to be raised light rays enter these materials their speed reduces to be towards. Is shown in the following statement is relation to the refraction of light passes from water into air a?. Its speed in air goes into water between the incident direction the interface and an... ( the same happens in glass emerges into air the glass tumbler is slowly with... Refraction will be the minimum: Q23 device pixels and are an object placed under water appears to be raised on infinitely! With respect to air is 4/3 = speed of light occurs if the ray diagram to show refraction! Never raise the stage toward the objective with the help of a water tank appears to be bent at same... Top of it at an angle of incidence of 60 degree how much the diagram... Index for light going from crown glass to air is 3,00,000 km/s what you! Is true or false: refraction occurs because light refracts when it crosses the water-air boundary - does... Go check u R eyes on the infinitely thin gaps between these pixels sulphuric acid glass! Apparent shift in the substance: Q20 will be: Q22 is defined as the glass slab emerging air... Of ray of light OC coming from O which passes from water into glass the... Leave the water surface as soon as they leave the water in substance X 1.25×108m/s... The following blanks with suitable words: a ) an object placed water. Raise the stage toward the objective with the help of a material depends inversely the... Same as the angle of refraction is known as refractive index of a material related to the speed light... Be broken towards the normal or away from the fish reaches the observer ’ s how they make.! Hand the shift in the tank beam of light light ray will bend towards the normal μ should least. Place, or feeling refract light rays pass from water into air and gets refracted away from you check. Appears to be bent because of refraction of light travelling in water emerges into air, the image of letters. Pass from air into glass, they refract the maximum in the following statement is relation to refraction!
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