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A fish looking up through the water sees the outside world, constant in a circular horizon. If the refractive index of water is 43and the fish is 12 cm below the water surface, the radius of this circle in cm is:

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a

367

b

36/7

c

365

d

45

answer is B.

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Detailed Solution

Radius of circle of illuminance,r=hμ2−1=12432−1⇒r=367cm

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A fish looking up through the water sees the outside world, constant in a circular horizon. If the refractive index of water is 43and the fish is 12 cm below the water surface, the radius of this circle in cm is: