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Q.

The refractive index of water is 1.33. The direction in which a man under water should look to see the setting sun is

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a

$49^{\circ} to the vertical$

b

Along the horizontal

c

$49^{\circ} to the horizontal$

d

$90^{\circ} with the vertical$

answer is C.

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Detailed Solution

Ray from setting sun will be refracted at angle equal to critical angle.
$C = \sin^{- 1} (\frac{1}{μ}) = \sin^{- 1} (\frac{1}{1.33}) = 49^{0}$

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