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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 a distance from the surface of water equal to $(μ_{w} = 4 / 3)$

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36 m

24 m

18 m

12 m

answer is A.

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Detailed Solution

$μ = \frac{Apparent depth}{Real depth}$
$μ \times$ Real depth = Apparent depth
apparent depth $= \frac{4}{3} \times 18 = 24 m$

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