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Question

A fish lies at the bottom of a 4 m deep water lake. A bird flies 6 m above the water surface and refractive index of water is 43. Then the distance between


A
Bird and image of fish is 8 m
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B
Fish and image of bird is 12 m
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C
Fish and image of bird is 8 m
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D
Fish and image of bird is 10 m
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Solution

The correct option is B Fish and image of bird is 12 m


Apparent depthReal depth=hh=μaμw
i.e h4=14/3=34h=3 m
Therefore, distance between the bird and image of the fish =6+3=9 m

If y is the apparent height of the bird above water,
y6=μwμa=43
y=8 m
So distance between the fish and the image of bird =4+8=12 m
Option (b) is correct.

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