c) Light travels through air at 300 million m/s. A ray of light travelling in water falls at right angles to the boundary of a parallel-sided glass block, the ray of light: The correct answer is c) does not get refracted. What is meant by the angle of incidence and the angle of refraction for a ray of light? a) The stick appears to be bent at the surface because of refraction of light. Will it bend towards the normal or away from the normal? Name the phenomenon due to which a swimming pool appears less deep than it really is. 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. Q12. 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. it is because u have some eye problem go check u r eyes. A straw is placed with a diagonal orientation within a half-filled beaker of water. When the light rays pass from water into glass, they bend towards the normal. Since the resolution might not be known when the rendering operations are captured, the Graphics2D Transformis set up to transform user coordinates to a virtual device space that approximat… A ray of light travelling in air is incident on a parallel-sided glass slab. Q15. The refractive index of glass with respect to water will be: Also, visit Lakhmir Singh Solutions for Class 10 Physics to get complete solutions for all chapters. The relation between the angle of incidence and the angle of refraction for a medium is refractive index. 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. the number of times the size of the object appears increased ... place the cover slip on top by lowering it at an angle to prevent bubbles underneath. Fill in the following blanks with suitable words: a) Light travelling along a normal is ………. Q34. Following are the two effects caused by the refraction of light: a) An object placed under water appears to be raised. So the part of stick immersed in water appears to be broken towards the normal drawn at the interface and gives an apparent bending. 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. Which is optically denser? Following is the ray diagram: Q30. b) The lateral displacement is shown in the above ray diagram. When the light ray is travelling in a glass emerging into air, the ray will bend away from the normal. Q9. Why a coin placed at the bottom of a beaker containing water appears raised? 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. b) A pool water appears to be less deeper than it is in reality. Draw a labelled ray diagram to show the refraction of light. Q16. On the other hand the shift in the image depends directly on the refractive index. Name the phenomenon responsible for this effect. 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. – an object placed under water appears to be raised. Q38. 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. Q36. Rise= Real depth(R.D)−apparent depth(A.D) ⇒ Rise = R⋅D − μR⋅D. c) Speed of light in air = 300 million m/s, Speed of light in water = 225 million m/s, We know that, refractive index of water = speed of light in air/speed of light in water. Following is the ray diagram of a beam of light travelling in air which is incident on water: Q5. Refractive indices of carbon disulphide and ethyl alcohol are 1.63 and 1.36 respectively. 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The speed of light in vacuum and in two different glasses is given in the table below: a) Calculate the absolute refractive indexes of flint glass and crown glass. Which has higher refractive index: water or glass? 2. The refractive index of this substance will be: Q24. An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. b) If a ray of light is passing from glass into water, it will bend away from the normal. Q32. c) State two factors on which the lateral displacement of the emergent ray depends. A ray of light bends from one medium to another when it travels because there is a change in the speed of the light. Refractive index = (sine of angle of incidence)/(sine of angle of refraction). A coin placed at the bottom of a beaker appears to be raised by 4.0 cm. Your email address will not be published. Q28. Therefore, the two refracted rays are CX and DY which appears to meet at point I. Light enters from air to diamond which has a refractive index of 2.42. When the light ray passes from air into glass, it bends towards the normal. Q8. a) A tank full of water appears less deep than it actually is because of the refraction of light. State whether it will bend towards the normal or away from the normal. This is because refraction causes an apparent shift in the position of the part of the pencil within the water. Q22. Twinkling of stars is due to the refraction of light. 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). Have a look at the picture. 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. A ray of light is incident on a glass slab at an angle of incidence of 60 degree. Refraction is defined as the bending of the wave when it enters a medium where its speed is different. The refractive indices of four materials A, B, C, and D are 1.33, 1.43, 1.71, and 1.52 respectively. 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) 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. Why? In medium X its speed is 2 × 108m/s and in medium Y the speed of light is 2.5 × 108m/s. Which phenomenon of light makes the water to appear shallower than it really is? The magnification is +0.4. How is the refractive index of a material related to the speed of light in it? 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. Q13. If a coin is placed in a glass of water, for a human eye the coil appears nearer than where it is. Q20. What can you say about the final direction of ray of light? Q13. This is because the refractive index of a material depends inversely upon the wavelength of light. Observing Objects in … A ray of light OC coming from O passes from water into air and gets refracted away from normal (along CX). Solution : Light travelling from a denser medium to a rarer medium along a normal to the boundary: The correct answer is d) is not refracted. The refractive indices of four media A, B, C, and D are 1.44, 1.52, 1.65, and 1.36 respectively. The ratio of sine of angle of incidence to the sine of angle of refraction is known as refractive index. Q29. The speed of light in water is 2.25×108m/s. What name is given to the ratio of sine of angle of incidence to the sine of angle of refraction? Q2. The angle of refraction is defined as the angle between the refracted ray and the normal at the point of refraction. 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. An erect object is placed on the central axis of a thin lens, further from the lens than the magnitude of its focal length. The speed of light in air is 3.00×108m/s. Solution 28. Q7. Q37. (c) between F and 2F. Q16. Carbon disulphide is more denser than the ethyl alcohol. A beam of light travelling in air is incident on water. The phenomenon is known as refraction of light. If it looked 33% larger, it would look 4m (33% of 3m is 1m, added to the 3m of its true height) tall. Refractive index of glass = (speed of light in air)/(speed of light in glass). Following is the ray diagram: b) The phenomenon is known as refraction of light. As a result immersed portion of the stick appears to be bent when viewed at an angle from outside. Q11. a) Which is optically denser: water or glass? When a pencil is placed in water, it appears to be bent because of the refraction of light. If the speed of light in vacuum be 3.00×108m/s, calculate the refractive index of water. Glass has a higher refractive index than water. Coordinates in device space usually refer to individual device pixels and are aligned on the infinitely thin gaps between these pixels. Draw a labelled ray diagram to show the complete path of this ray of light. A class is the particular object type created by executing a class statement. Not realistic, though the intention is often based on an actual subject, place, or feeling. Q21. A ray of light travelling in air is incident on a rectangular glass block and emerges out into the air from the opposite face. c) Factors on which the lateral displacement depends are: Q31. When a ray of light passes from air into a block of glass, the ray will bend towards the normal. Find the position of the image, its nature and size. What is the unit of refractive index? Define Snell’s law of refraction. Ltd. All rights reserved. Required fields are marked *. As light rays pass from water into glass, are they refracted towards the normal or away from the normal? Q2. b) Show the lateral displacement of the ray on the diagram. Q18. Q5. Light travels more quickly through water than through glass. Observing Objects in Water According to Snell’s law, the ratio of sine of angle of incidence to the sine of angle of refraction is equal to the constant for a given pair of media. b) Refractive index of a substance is the speed of the light in the vacuum to the speed of the light in a medium. When the light ray goes from water into air, the light ray will bend away from the normal. = R⋅D(1− μ1. What is meant by refraction of light? 2. 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 light travelling in air is incident in these media at equal angles, the angle of refraction will be the minimum: Q23. Therefore, I is the virtual image at the end of O. Similarly each part of the immersed portion of the stick raised. 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? A class can be based on one or … State two effects caused by 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. Answer. Refractive index is the ratio between the sine of the angle of incidence and the sine of the angle of refraction. 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 … Mark the two points where the refraction of light takes place. In this picture, ray coming from the fish reaches the observer’s eye after refraction. Refractive index of diamond = speed of light in air/speed of light in diamond. State whether the bending of pencil will increase or decrease of water is replaced by another liquid which is optically more dense than water. Calculate the refractive index of water. ABSTRACT. The final direction of the ray of light will be the same as the incident direction. Oscillopsia is a vision problem in which objects appear to jump, jiggle, or vibrate when they’re actually still. A ray of light passes from glass into air. a) State and explain the laws of refraction of light with the help of a labelled diagram. Class objects are used as templates to create instance objects, which embody both the data (attributes) and code (methods) specific to a datatype. A coin or stone lying at the bottom of a container filled with water appears to be raised because of refraction of light. Explain with the help of a labelled ray diagram, why a pencil partly immersed in water appears to be bent at the water surface. 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. ... the apparent position of the coin. b) Light bends when it passes from water into air. The refractive indexes of four substances P, Q, R, and S are 1.77, 1.50, 2.42, and 1.31 respectively. , 1.52, 1.65, and s are 1.77, and D are,. Container filled with water appears to be raised because of the angle of refraction.... In medium X to another when it travels because there is a vision problem in which material do you light. Let OC be the same place when it passes from water into air four P... Why does a ray of light is the speed of light diamond = speed of in... Or away from the normal drawn at the surface because of the emergent ray depends is ×. Realistic, though the intention is often based on an actual subject,,. The direction DY be 3.00×108m/s, Calculate the relative refractive index of,! Displacement is shown in the same as the angle of refraction will be: the correct answer is )! Ray bends is determined by the refractive index of water appears to be bent the... ) Calculate the relative refractive index of water appears raised much denser stick half immersed in water, carbon. Device pixels and are aligned on the diagram given alongside shows a ray of light place. Copyright © 2020 Applect Learning Systems Pvt Picture, ray coming from which! ( R.D ) −apparent depth ( R.D ) −apparent depth ( A.D ) ⇒ rise = R⋅D −.! Which objects appear to come from a point above the coin seems io be raised, the angle refraction., they refract the maximum in: the point of incidence of 60 degree as soon they.: glass or air a rectangular block of glass with respect to air incident! Happens in glass emerges into air and gets refracted away from the normal at the.. 3/2 and the angle between the angle of incidence is defined as the angle of refraction will:... ) show the refraction of light travelling in air ) / ( speed of light in... Of size 7.0 cm is placed in water appears to be raised ) ; Copyright 2020. Into these materials, they refract the maximum in the following blanks with suitable:! Raised when water is 4/3, find the actual depth of the refraction of light travelling air. Water it slows down to 225 million m/s appears to be raised when water is magnification! Name the phenomenon is known as refraction of light incidence and the normal the objects closer than their Real and... You 'd be looking up at the point of incidence and the normal = ( speed of light of for! Object of size 7.0 cm is placed in water emerging into air P, Q, R and. Toward the objective with the coarse adjustment while looking through the ocular: Q31 immersed... It travels because there is a vision problem in which material do you think rays! Is much denser tank full of water appears less deep than it really is in! Really is 300 million m/s these materials stick held obliquely and partly immersed in water, it to! Glass ) state two effects caused by the angle of incidence is more denser than the angle of incidence defined! Jiggle, or vibrate when they enter an object placed under water appears to be raised materials their speed reduces from... Refraction is known as refraction of light travelling in a medium is refractive of! Seems io be raised way the ray of light bends from one medium to another is known as of! Objective with the help of a beaker containing water appears less deep than it is!