Question

State the conditions for the phenomenon of total internal reflection to occur

Answer 1

Total internal reflection – conditions, critical angle. ... The critical angle occurswhen the incident angle causes the angle of refraction to be 90 degrees from the normal. During total internal reflection, no refraction whatsoever occurs; all of the light is reflected within the original medium.

Answer 2

1. Wave should be transversing from denser to rarer medium.

2. The angle of incidence should be greater than the critical angle.

# Critical angle is that angle of incidence for which the angle of refraction is 90 degrees.