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Study Material for Class 10 Science Chapter 10 Light Reflection and Refraction
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Class 10 Science Chapter 10 Light Reflection and Refraction
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LIGHT – REFLECTION AND REFRACTION
ASSIGNMENT QUESTIONS SET – 1
1. Define refraction.
2. Define refractive index.
3. What is the unit of refractive index?
4. List out the factors on which the refractive index of a medium depends.
5. Define angle of incidence.
6. What is the angle of incidence if a ray of light is incident normal to the surface separating the two media?
7. What is a lens?
8. What is a concave lens?
9. What is the nature of the focus of a concave lens?
10. What type of image is formed by a concave lens?
11. A thin lens has a focal length f = -12 cm. Is it convex or concave lens?
12. A lens forms an erect image for all positions of the object in front of it. Is the lens convex or concave?
13. Where should an object be placed so that a real and inverted image of same size is obtained using a convex lens?
14. Write the relation between u,v and f of a thin lens.
15. What is the sign of u, v and f for a convex lens according to Cartesian sign convention?
16. An object of height 1m is placed at a distance of 2f from a convex lens. What is the height of the image formed?
17. Define power.
18. What is least distance of distinct vision?
19. What happens when a ray of light passes through the optical centre of a lens?
20. State the laws of refraction.
21. Diagrammatically represent the refraction of light through a rectangular glass slab.
22. Define convex lens. Why is it referred to as converging lens?
23. Draw a diagram to show the second principal focus of a convex lens.
24. Distinguish between a convex and a concave lens.
25. Draw a ray diagram to show the refraction of light when it passes through the optic centre of a convex lens.
26.List out the uses of convex lenses.
27. With the help of a ray diagram show how an object gets magnified in a simple microscope.
28. Define the power of a lens. What is its unit?
29. With the help of a diagram explain how light gets refracted when it passes through a rectangular glass slab.
30. An object is placed at a distance of 50 cm from a concave lens of focal length 20 cm. Find the nature and position of the image.
31. An object is placed 50 cm from a lens which produces a virtual image at a distance of 10 cm in front of the lens. Draw a diagram to show the formation of image and calculate the focal length of the lens.
32. An object of height 4 cm is placed at a distance of 10 cm from a convex lens of focal length 20 cm. Find the position, nature and size of the image.
33. What is the power of a lens having a focal length of a) 50 cm b) -50cm.
34. Draw a ray diagram to show the position and nature of the image formed by a convex lens when the object is placed a) at 2F1 b) between F1 and 2F1 c) beyond 2F1
35. State and verify Snell's law.
36. The bending of a beam of light when it passes obliquely from one medium to another is known as _______.
1. reflection
2. refraction
3. dispersion
4. deviation
37. The part of the lens through which the ray of light passes without suffering deviation is called ________.
1. optical centre
2. focus
3. centre of curvature
4. pole
38. Convex lens always gives a real image if the object is situated beyond _______.
1. optical centre
2. centre of curvature
3. Focus
4. radius of curvature
39. Parallel rays of light entering a convex lens always converge at _______.
1. centre of curvature
2. the principal focus
3. optical centre
4. the focal plane
40. Where should an object be placed so that a real and inverted image of the same size is obtained, using a convex lens?
1. Between O and F
2. At F
3. At 2 F
4. At infinity
41. SI unit of the power of a lens is ___________.
1. dioptre
2. cm
3. metre
4. watt
42. 1 D is the power of the lens of focal length of ______ cm.
1. 100
2. 10
3. 1/100
4. 1/10
43. In a simple microscope lens used is __________.
1. biconvex
2. biconcave
3. plano convex
4. cylindrical
44. Reciprocal of focal length in metres is known as the ______ of a lens.
1. focus
2. power
3. power of accommodation
4. far point
45. A convex lens is called _________.
1. converging lens
2. diverging lens
3. both converging and diverging lens
4. refracting lens
46. A positive magnification greater than unity indicates _____________________.
1. real image
2. virtual image
3. neither real not virtual image
4. distorted image
47. The power of a convex lens of focal length 50 cm is ______.
1. + 2D
2. - 2D
3. 50 D
4. - 5D
48. The focal length of a lens whose power is -1.5 D is _______.
1. -66.66 cm
2. + 1.5 m
3. + 66.66 cm
4. -1.5 m
49. Real images formed by single convex lenses are always ________________.
1. on the same side of the lens as the object
2. Inverted
3. Erect
4. smaller than the object
50. An object is placed 12 cm from a convex lens whose focal length is 10 cm. The image must be.
1. virtual and enlarged
2. virtual and reduced in size
3. real and reduced in size
4. real and enlarged
51. When a person uses a convex lens as a simple magnifying glass, the object must be placed at a distance.
1. less than one focal length
2. more than one focal length
3. less than twice the focal length
4. more than twice the focal length
52. The image produced by a concave lens is ________.
1. always virtual and enlarged
2. always virtual and reduced in size
3. always real
4. sometimes real, sometimes virtual
53. A virtual image is formed by _______.
1. a slide projector in a cinema hall
2. the ordinary camera
3. a simple microscope
4. Telescope
54. An object is placed 25 cm from a convex lens whose focal length is 10 cm. The image distance is ________ cm.
1. 50 cm
2. 16.66 cm
3. 6.66 cm
4. 10 cm
55. The least distance of distinct vision is ______.
1. 25 cm
3. 0.25 cm
4. 2.5 m
56. A convex lens has a focal length of 20 cm. Its power in dioptres is
___________.
1. 2
2. 5
3. 0.5
4. 0.2
57. An object is placed before a concave lens. The image formed _____________-.
1. is always erect
2. may be erect or inverted
3. is always inverted
4. is always real
58. A ray of light travels from a medium of refractive index n1 to a medium of refractive index n2. If angle of incidence is i and the angle of refraction is r, then sini /sinr is equal to
1. n1
2. n2
3. n21
4. n12
59. Two thin lenses of power +5 D and -2 D are placed in contact with each other. Focal length of the combination is
1. +3 m
2. -3 m
3. 0.33 m
4. -0.33 m
61. An object is placed between two plane mirrors inclined at an angle of 45° to each other. How many images do you expect to see?
62. How can an inverted image of an object be obtained with a plane mirror?
63. How many images of himself can an observer see in a room whose ceiling and two adjacent walls are mirrors?
64. A convex mirror is held in water. What should be the change in its focal length?
65. If the light from the Sun subtend an angle Q at the pole of a concave mirror of focal length f, where will it converge? Also find the diameter of the image. Draw the necessary ray diagram.
66. When does Snell’s law of refraction fail?
67. How does the frequency of a beam of ultraviolet light changes when it goes from air to glass?
68. State two conditions under which a ray of light suffering refraction from medium 1 to medium 2 does not undergo any change in direction.
69. Name the factor on which lateral shift produced by glass slab depends?
70. A glass lens is immersed in water. How is the power of the lens affected?
71. Why is the power of a lens is measured as reciprocal of focal length? Give reason.
72. A convex lens is made of a material of refractive index m1 when placed in a medium of refractive index m2, behaves as a diverging lens. How are m1 and m2 related?
73. An object is held at a distance of 60 cm from a convex mirror of focal length 20 cm. At what distance from the mirror, should a plane mirror be held so that images in the two mirrors coincide?(ans. 22.5 cm).
74. How do you find the rough focal length of a convex lens? Is the same method applicable to a concave lens?
75. Which factors determines the focal length of a lens?
76. The formula for linear magnification of a spherical mirror is m=h’/h = -v/u. What determines the sign of m? What is the significance of this sign?
77. A convex lens made of material of refractive index n2 is kept in a medium of refractive index n1. A parallel beam of light is incident on the lens. Compare the path of rays of light emerging from the convex lens if (i)n1<n2 (ii)n1=n2 (iii) n1>n2
78. A concave lens of focal length 25 cm and a convex lens of focal length 20 cm are placed in contact with each other. What is the power of this combination? Also, calculate focal length of this combination. (ans. 1m)
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