Question

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

• A.
• B.
• C.
• D.

Answer 1

The correct option is D

$E_{incident}=E_{reflected}+E_{transmitted}$
as same, $I_{incident}=I_{reflected}+I_{transmitted}$

Option 1:
At a critical ange ${\theta }_c$, all waves should not transmits, it is an angle where all the wave being reflected completely.
hence, option A is wrong.

Option 2:
At $\theta =0^o$, system have full energy (reflected+transmitted), which is impossible.
hence, this option is also wrong.

Option 4:
This option shows, some delay between reflection and transmission.
Hence, this option is also wrong .

So, from the above discussion only option C is correct.