| 1. | The refractive index of water is 1.33. The speed of light in water will be ? | |
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2.66 × 10^8 m/s
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2.26 × 10^8 m/s
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3 × 10^8 m/s
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1.33 × 10^8 m/s
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Report Question| 2. | In case of refraction, when the light passes from rarer to a denser medium, if the angle of incident is 65o and angle of refraction is 25o, then the deviation of angle would be ? | |
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40°
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30°
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25°
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65°
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| 3. | In order to obtain a magnification of ?2 (minus 2) with a concave mirror, the object should be placed ? | |
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Beyond the centre of curvature
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At the centre of curvature
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Between pole and focus
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Between focus and centre of curvature
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| 4. | A magnified real image is formed by a convex lens when the object is at ? | |
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between F and 2F
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F
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only (a) and (b) both
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2F
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| 5. | A concave mirror of radius 30 cm is placed in water. It’s focal length in air and water differ by ? | |
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0
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30
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20
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15
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| 6. | The refractive index of water is 1.33. The speed of light in water will be ? | |
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2.66 × 10^8 m/s
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3 × 10^8 m/s
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1.33 × 10^8 m/s
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2.26 × 10^8 m/s
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| 7. | Magnification produced by a rear view mirror fitted in vehicles ? | |
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can be more than or less than one depending upon the position of the object in front of it.
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is more than one
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is less than one
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is equal to one
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| 8. | Which of the following statements is/are true ? | |
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A concave lens has – 4 dioptre having a focal 0.25 m
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A concave lens has 4 dioptre power having a focal length 0.25 m
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A convex lens has 4 dioptre power having a focal length 0.25 m
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A convex lens has -4 dioptre power having a focal length 0.25 m
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| 9. | The image formed by a convex lens can be ? | |
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virtual image is not formed
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virtual and of same size
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virtual and diminished
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virtual and magnified
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| 10. | A 10 Mm long awl pin is placed vertically in front of a concave mirror. a 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. the focal length of this mirror is ? | |
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– 60 cm
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– 40 cm
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– 20 cm
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– 30 cm
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