In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction ?

Question

In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction ? (A) equal to angle of incidence (B) 90° (C) 180° (D) 0°

Tardigrade Admin · Accepted Answer

At i = ic, refracted ray grazes with the surface. So angle of refraction is 90°

Q. In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction ?

equal to angle of incidence

$9 0^{\circ}$

$18 0^{\circ}$

$0^{\circ}$

At $i = i_{c}$ , refracted ray grazes with the surface.
So angle of refraction is $9 0^{\circ}$