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Q.

A concave mirror of focal length f (in air) is immersed in water (μ = 4/3). The focal length of the mirror in water will be

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a

3/4

b

f

c

4/3 f

d

7/3 f

answer is A.

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Detailed Solution

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Focal length of any mirror will be irrespective of the medium.

So the focal length of the mirror in water will be f

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A concave mirror of focal length f (in air) is immersed in water (μ = 4/3). The focal length of the mirror in water will be