| 1. | An object at a distance of + 15 cm is slowly moved towards the pole of a convex mirror. The image will get ? | |
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enlarge and virtual
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diminished and virtual
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enlarged and real
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shortened and real
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Report Question| 2. | 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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| 3. | When a ray of light is incident normally, the angle of incidence is ? | |
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90
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45
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0
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none
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| 4. | choose the statement which is/ are incorrect ? | |
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Greater the difference in the speed of light in the two media, greater will be the amount of refraction or bending of light.
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The refraction of light take place at the boundary between the two media.
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The bending of light when it goes from one medium to another obliquely is called refraction of light.
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The speed of light in air is 3 x 10 to power 18 m/s whereas that in glass is 2 x 10 to power 8 m/s.
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| 5. | A Concave Mirror Produces Magnification Of +4. The Object Is Place(d) ? | |
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Beyond the centre of curvature
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Between focus and pole
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Between focus and centre of curvature
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At the focus
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| 6. | If a man’s face is 25 cm in front of concave shaving mirror producing erect image 1.5 times the size of face, focal length of the mirror would be ? | |
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60 cm
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15 cm
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75 cm
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25 cm
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| 7. | An object at a distance of 30 cm from a concave mirror gets its image at the same point. The focal length of the mirror is ? | |
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+15 cm
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– 15 cm
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– 30 cm
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30 cm
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| 8. | Refraction of light by the earth’s atmosphere due to variation in air density is called ? | |
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atmospheric scattering
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atmospheric refraction
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atmospheric dispersion
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atmospheric reflection
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