JEE Main & Advanced Physics Ray Optics Sample Paper Topic Test - Refraction of Light Through Plane Surfaces

In the given curve of the above question, find the value of angle \[{{i}_{1}}\] in degrees.

A) \[{{40}^{o}}\]

B) \[{{60}^{o}}\]

C) \[{{70}^{o}}\]

D) \[{{90}^{o}}\]

Correct Answer: D

Solution :

[d] When angle of incidence is \[{{i}_{1}},\,\,e={{40}^{o}}\] (from reversibility of ray) also \[\delta ={{70}^{o}}\]

\[\Rightarrow \] \[{{70}^{o}}={{i}_{1}}+{{40}^{o}}-A\Rightarrow {{i}_{1}}={{90}^{o}}\]