A point source is placed at a depth h below the surface of water (refractive index = μ).
(a) Show that light escapes through a circular area on the water surface with its center directly above the point source.
(b) Find the angle subtended by a radius of the area on the source.
(a) Let x= radius of the circular area
S be the point source
H is the depth
So, clearly from the fig., light escapes from the circular area at a fixed desistance r on the water surface, directly above the point source S.
(b) The angle subtended by a radius of the area on the source S