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A catfish is 2.4 m below the surface of a smooth lake. (a) What is the...

A catfish is 2.4 m below the surface of a smooth lake. (a) What is the diameter of the circle on the surface through which the fish can see the world outside the water? (b) If the fish descends, does the diameter of the circle increase, decrease, or remain the same? Assume that the index of refraction of water is 1.333.

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Answer #1

The fish can see the outside world until the angle of incidence becomes greater than critical angle from water to air. We use this to find the required solution as shown below.

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