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A diver in a lake wants to signal his di...

A diver in a lake wants to signal his distress to a person sitting on the edge of the lake flashing his waterproof torch. He should direct the beam

A

vertically upwards

B

horizontally

C

at an angle of the vertical which is slightly less than critical angle

D

at an angle to the vertical which is slightly more than the critical angle

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The correct Answer is:
C
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CP SINGH-REFRACTION OF LIGHT BY PLANE SURFACES-Exercises
  1. A fish looking up through the water sees the outside world contained i...

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  2. A point source of light is placed 4m below the surface of a liquid of ...

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  3. A diver in a lake wants to signal his distress to a person sitting on ...

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  4. A light beam is travelling from Region I to IV (figure). The refractiv...

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  5. A transparent solid cylindrical rod has a refractive index of (2)/(sqr...

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  6. Light enters at an angle of incidence in a transparent rod of refracti...

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  7. When light is incident on a medium at angle i and refracted into a sec...

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  8. A rectangular slab ABCD, of refractive index n1 , is immersed in water...

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  9. A ray of light travels from an optically denser to rarer medium. The c...

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  10. A ray of light travels from a medium of refractive index mu to air. It...

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  11. The reason for shining of air bubble in water is

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  12. Which of the following is not due to total internal reflection ?

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  13. Consider telecommunication through optical fibres. Which of the follow...

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  14. Pick out the correct staments about optical fibres from the following:...

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  15. Which of the following options are correct regarding prism?

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  16. When a ray of light is refracted by a prism such that the angle of dev...

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  17. Deviation delta produced by a prism of angle A, which is assumed to be...

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  18. The refracting angle of a prism is A and refractive index of the mater...

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  19. If the refracting angle of a prism is 60^@ and the minimum deviation i...

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  20. A ray of light passes through an equilateral glass prism in such a man...

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