Question
A fish looks upwards at an unobstructed overcast sky. What total angle does the sky appear to subtend ? (Take refractive index of water is $\sqrt{2}$ )(a) $180^{\circ}$(b) $90^{\circ}$(c) $75^{\circ}$(d) $60^{\circ}$
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If total internal reflection takes place, then the image of the sky cannot be seen by the fish. Show more…
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