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Question

# A fish look up through the water sees the outside world containing in a circular horizon. The radius of the circle is 12√7 cm. The depth of the fish from the water surface is [Refractive index of water is 43]

A
14 cm
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B
21 cm
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C
28 cm
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D
35 cm
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Solution

## The correct option is C 28 cmGiven, R=12√7 cm ; μ=43 From the circle of illuminance we get, R=h√μ2−1 ⇒h=R√μ2−1 h=12√7√(43)2−1=12√7×√73 ∴h =4×7=28 cm <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence, (C) is the correct answer.

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