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A fish rising vertically to the surface of water in a lake uniformly at the rate of3m/s observes a king fisher bird diving vertically towards water at the rate 9 `m//s` vertically above it. If the refractive index of water is `4//3`, find the actual velocity of the dive of the bird in `cm//sec`.

A

6

B

4.5

C

1.5

D

2

Text Solution

Verified by Experts

The correct Answer is:
B
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AAKASH SERIES-GEOMETRICAL OPTICS-ADDITIONAL PRACTICE EXERCISE (LEVEL-II LECTURE SHEET(ADVANCED) STRAIGHT OBJECTIVE TYPE QUESTIONS)
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  15. A ring of radius 1cm is placed 1m in front of a spherical glass ball...

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  17. A light ray travelling parallel to the principal axis of a convex lens...

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  18. Twot thin lenses when placed in contact, then the power of combination...

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  19. A convex lens is placed some where between an object and a screen whic...

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