Q. A ray of light incident normally on one face of a right angled isosceles prism. It them grazes the hypotenuse. The refractive index of the material of the prism is
A) 1.33
B) 1.414
C) 1.5
D) 1.732
Explanation
(b) Refractive index, $\mu = \frac{1}{\sin C},$
Where $C$ is the critical angle
Here, $C = 45{^\circ}$
$\therefore\ \mu = \frac{1}{\sin{45{^\circ}}}$
$or\ \mu = \ \sqrt{2}$
$or\ \ \mu = 1.414$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.