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

Question

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

G1 Physics · Accepted Answer

Step 1: The critical angle is defined for a ray going from denser to rarer medium. Step 2: At exactly the critical angle, the refracted ray just grazes the interface. Step 3: Its angle with the normal is 90°. Final answer: (C) 90°.