Refractive index of water is \( 5 / 3 \). A light source is placed ...

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Refractive index of water is \( 5 / 3 \). A light source is placed in water at a depth of \( 4 \mathrm{~m} \). Then what must
\( \mathrm{P} \)
be the minimum radius of disc placed at water
W
surface so that the light of source can be stopped?
(1) \( 3 \mathrm{~m} \)
(2) \( 4 \mathrm{~m} \)
(3) \( 5 \mathrm{~cm} \)
(4) infinite
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