In a beaker filled with a liquid of refractive index \( 5 / 3 \), a point source of light is pla...

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In a beaker filled with a liquid of refractive index \( 5 / 3 \), a point source of light is placed \( 2 \mathrm{~m} \) below the \( \sqrt{3} \) surface of water. To cut off all light coming out of water from the source, what should be the minimum diameter of a disc that should be placed over the source on the surface of water?
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