An isotropic point source is placed at a depth below the water surface
PHYSICS · Subjective · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments
Problem
An isotropic point source is placed at a depth h below the water surface. A floating opaque disc is placed on the water surface so that the source is not visible from above the surface. What is the minimum radius of the disc? Take the refractive index of water to be μ.