A point soujrce of light is placed 4 m below the surface of water of refractive index `(5)/(3).` The minimum diameter of a disc,

A point soujrce of light is placed 4 m below the surface of water of refractive index `(5)/(3).` The minimum diameter of a disc, which should be placed over the source, on the surface of water to cut off alol light coming out of water is
A. infinite
B. `6 m`
C. `4 m`
D. `3 m`

A point soujrce of light is placed 4 m below the surface of water of refractive index `(5)/(3).` The minimum diameter of a disc, which should be place

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