Class 10th Chapter Light : Reflection and Refraction MCQs (Science)

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Chapter Name : Light (Reflection and Refraction)

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No. of Questions : 50

Questions
1. Where Should an object be placed in fornt of a convex lens to get a real image of the same size of the object? At the principal focus of lens At twice the focal length At Infinity None of these
2. A Spherical mirror and a thin spherical lens have each a focal length -15cm. The mirror and the lens are likely to be both concave both convex the mirror is concave and lens is convex. the mirror is convex and lens is concave.
3. Which of the following lenses would you prefer to use while reading small letters found in a dictionay? A convex lens of focal length 50cm. A concave lens of focal length 50cm. A convex lens of focal length 5cm. A concave lens of focal length 5cm.
4. An object is situated at a distance of f/2 from a convex lens of focal length f. Diatance of image will be - +(f/2) +(f/3) +(f/4) -f
5. An object is placed 60cm in front of a concave mirror. The real image formed by the mirror is located 30cm in front of the mirror. What is the objects magnification? +2 -2 +0.5 -0.5
6. Two plane mirrors are set at right angle and a floweris placed in between the mirrors. The number of images of the flower which will be seen is One Two Three Four
7. A man is 6.0 ft tall. What is the smallest size plane mirror he can use to see his entire image 3.0 ft 6.0 ft 12 ft 24 ft
8. An object is placed 60 cm in front of a convex mirror. The virtual image formed by the mirror is located 30 cm behind the mirror. What is the object's magnification +2 -2 +0.5 -0.5
9. Light rays A and B fall on optical component X and come out as C and D. The Optical component is a Concave lens Convex lens Convex Mirror Prism
10. An object is placed 20.0 cm in front of a ceoncave mirror whose focal length is 25.0 cm. What is the magnification of the object ? +5.0 -5.0 +0.20 -0.20
11. An object is placed at the radius of curvature of a concave spherical mirror. The image formed by the mirror is located at the focal point of the mirror. located between the focal point and the radius of curvature of the mirror. located at the center of curvature of the mirror. located out beyond the center of curvature of mirror.
12. If the refractive indices for water and diamn relative to air are 1.33 and 2.4 respectively, then the refractive index of diamond relative to water is - .55 1.80 3.19 None of these
13. There is an equiconvex lens of focal length of 20cm. If the lens is cut into two equal parts perpendicular to the principal axis, the focal length of each part will be 20 cm 10 cm 40 cm 15 cm
14. An object is placed 20.0 cm in front of a concave mirror whose focal length is 25.0 cm. Where is the image located? 1.0 x 10^2 cm in front of the mirror 1.0 x 10^2 cm behind the mirror 5.0 x 10^1 cm in front of mirror 5.0 x 10^2 cm behind the mirror
15. When viewed vertically a fish appears to be 4 meter below the surface of the lake. If the index of refraction of water is 1.33, then the true depth of the fish is 5.32metres 3.32 metres 4.32 metres 6.32 metres
16. Light Waves Required air or another gas to travel through Required an electric field to travel through Required a magnetic field to travel thrugh Can travel through perfect vaccum
17. An object is placed 40.0 cm in front of a convex mirror. The image appears 15 cm behind the mirror. What is the focal length of the mirror? +24 +11 -11 -24
18. Morning sun is not so hot as the mid day sun because Sun is cooler in the morning Heat rays travel slowly is the morning It is God Gift The sun rays travel a longer distance through atmosphere in the morning
19. The layered lens shown below is made of two different transparent materials. A point object is placed on its axis. The object will form one image infinite images no image two images
20. An object is placed in front of a concave mirror of focal length 50.0 cm and a real image is formed 75 cm in front of the mirror. How far is the object from the mirror 25 cm 30 cm 150 cm -150 cm
21. A number of images of a candle flame can be seen in a thick mirror. The brightest image is Forth Second Last First
22. A ray from air enters water, then through a thick layer of glass placed below water. After passing through glass, it again comes out in air medium. Then final emergent ray will Bend towards the normal Bends away from the normal Suffer lateral displacement Have the same path as if it had not passed through glass and water
23. A concave spherical mirror has a radius of curvature of 100 cm. What is its focal length 50 cm 100 cm 200 cm 300 cm
24. Light is incident on an air-water interface at an angle of 25° to the normal. What angles does the refracted ray make with the normal 19° 34° 25° 90°
25. Light reflected from a boundary between an unknown substance and air is seen to become 100% polarized when the angle of incidence is 62.0°. What is the index of refraction of the unknown substance? 1.88 1.13 2.14 0.532
26. An object is placed 10.0 cm from a diverging lens which forms an image 6.5 cm fromt the lens. What is the focal length of the lens? Include the sign. +3.9 -16.5 cm -21.2 cm -18.6 cm
27. Under what condidtions does a diverging lens form a virtual image of a real object Only if u>f. Only if u. Only if u=f. A diverging lens always forms a virtual image of a real object.
28. A convex lens of focal length 25 cm receives light from the sun. A diverging lens of focal length -12cm is placed 37 cm to the right of the converging lens. Where is the final image located relative to the diverging lens? 6 cm to the left 25 cm to the left At infinty 12 cm to the right
29. A lens produces a enlarged, virtual image. What kind of lens is it? Converging Diverging It could be either diverging or converging None
30. A camera lens focuses light from a 12.0 m tall building located 35.0 m away on film 50.0 mm behind the lens. How tall is the image of the building on the film? 17.1 mm 7.00 mm 2.50 mm 1.25 mm
31. In an experiment to determine the focal length of a concave lens, a student obtained the image of a distant window on screen. To determine the focal length of the lens, she/he should measure the distance between the lens and the screen only lens and the window only screen and the windows only screen and the lens and also between the screen and the window
32. On the basis of experiment 'to trace the path of a ray of light passing through a rectangular glass slab' four students arrived at the folowing interpretations : I. Angle of incidence is greater than the angle of emergence II. Angle of emergence is less than the angle of refraction III. Emergent ray is parallel to the incident ray. IV. Emergent ray is parallel to the refracted ray. The Correct interpretations is that of the student. I II III IV
33. Light waves are mechanical waves are electromagnetic waves travel with the same velocity in all media requies a material medium for their propagation
34. Virtual images of object of the same size are formed by a concave mirror a convex mirror a plane mirror all the above
35. Two plane inclined mirrors form 5 images by multiple reflecion. The angle of inclination is 90° 60° 45° 30°
36. A bright x (cross) mark is made on a sheet of white paper. Over the white paper a rectangular glass-slab of thickness 3 cm is placed. On looking through, the image of the mark appears above the mark. It is below the upper surface of the slab by 2.5 cm 1.5 cm 2 cm 1.75 cm
37. The critical angle of a transparent medium denser than air increases with its refractive index decreases with its refractive index is independent of its refractive index None of these
38. Orange, blue and yellow are 3 of the colours formed by a prism. Their order according to increasing deviation is blue, orange, yellow yellow, ble, orange blue, yellow, orange orange, yellow, blue
39. Images formed by an object placed between two plane mirrors whose reflecting surfaces make an angle of 90° with one another lie on a Straight line Zig-zag curve Circle Ellipe
40. A diver in a swimming pool wants to sinal his distress to a person lying on the edge of the pool by flashing his water-proof torch He must direc beam of light vertically upwards He must direct the beam horizontally He must direct the beam at an angle of the vertical which is sightly lesser than the critical angle He must dirct the beam at an angle o the vertical whicch is sightly greater than the critical angle
41. Two plane mirror are inclined at an angle θ. A ray of light is incident on one mirror and is then reflected from the other mirror. Then the angle between the first ray and the final ray will be θ 2θ between θ and 2θ >2θ
42. In cmparison to the case when a ray of light travels form glass to air, the critical angle for total internal reflection of light when a ray of light travels from glass to water is greater smaller same nothing can be predicted
43. A glass slab is placed in the path of a beam of convergent light, then the point on convergence of light moves towards the glass slab moves away from the glass slab remains at the sam e point undergoes a lateral shift
44. A real image is formed by a convex mirror when the object is placed at infinity between center of curvature and focus between focus and pole none of the above
45. A virtual image is formed by a concave mirror when the object is placed between infinity and center of curvature center of curvature and focus focus and pole All the above
46. Which of the following are usen in Kaleidoscope plane mirror concave convex mirrors all the above
47. When a spherical convex lens made up of glass is immersed in water, its focal length decreases does not change increases none of the above
48. A person standing at some distance from a mirror finds his image erect, virtual and of the same size. Then the mirror is possibly plane mirror concave mirror plane or concave mirror plane or concave or convex mirror
49. Power of convex mirror is positive negative zero infinity
50. Out of the following (a) pole (b) focus (c) radius of curvature (d) principal axis for a spherical mirror, the quantities that do not depend on wheteher the rays are paraxial or not, are a,b,c and d only a,b and c only a,c and d only a and d

ANSWER
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