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Question

A bright point source of light is under water at a depth 12 cm. An observer's eye is at a height 12 cm above the surface of water. The distance of the image of the point source from the eye of the observer is (take refractive index of water as 4/3)
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A
21cm
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B
9cm
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C
28cm
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D
16cm
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Solution

The correct option is A 21cm
Solution
The distance of image from observer
=observer's height + apparent depth
We know,
apparentdepthrealdepth=1μ
Here, A.D=(34) R.D.
AD=34×12=9cm
So, Image distance = 12cm + 9cm
= 21 cm
option A is correct.

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