A light ray travelling in glass medium is incident of glass- air interface at an angle of incidence `theta`. The reflected `(R )` and transmitted (T) intensities, both as function of `theta`, are plotted The correct sketch is

Options

A.
B.
C.
D.

Answer

C

Explanation

Light ray is travelling from glass to air . Initially at smaller of incidences reflected energy will be less because it is due to partial election only. But after the angle of incidence becomes greater than critical angle then entire energy is reflected back in glass to total internal reflection. Hence, option (c) is correct because it shows abrupt change in intensities when angle of incidence is greater than critical angle.