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Q.

A concave mirror of focal length 20cm (in air) is immersed in water ( $μ$ = 4/3). The focal length of the mirror in water will be

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a

$\frac{7}{3}$ f

b

20 cm

c

$\frac{4}{3}$ f

d

$\frac{3}{4}$ f

answer is A.

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Detailed Solution

For a mirror, converging or diverging nature does not change with changing the medium or space around the mirror. So, f = 20 cm

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