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Question

An under water swimmer is at a depth of 12 m below the surface of water. A bird is at a height of 18 m from the surface of water, directly above his eyes. For the swimmer the bird appears to be at a distance from the surface of water equal to : (Refractive index of water is 4/3)

A
24 m
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B
12 m
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C
18 m
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D
9 m
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Solution

The correct option is D 24 m
Accordingtoquestion................Here,thebirdliesinAirmediumandobserveristheswimmerwhichliesinwater.sothat,Refractiveindexofwater(μ)=43μ=realheightapparentheight43=realdepth18realheight=43×18=24realheight=24mabovethesurfaceofwater.sothecorrectoptionisA.

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