A point source of light is placed at the bottom of a vessel which is filled with water of refractive index `mu` to a height h. I

A point source of light is placed at the bottom of a vessel which is filled with water of refractive index `mu` to a height h. If a floating opaque disc has to be placed exactly above it so that the source is invisible from above, the radius of the disc should be-
A. `(h)/(sqrt(mu-1))`
B. `(h)/(sqrt(mu^(2)-1))`
C. `(h)/(mu^(2)-1)`
D. `(muh)/(sqrt(mu^(2)-1))`

A point source of light is placed at the bottom of a vessel which is filled with water of refractive index `mu` to a height h. If a floating opaque di

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