Question

What is a necessary condition for total internal reflection
in a medium?
A. when the angle of incidence is equal to the critical angle
B. when the angle of incidence is greater than the critical angle
C. when the angle of refraction is equal to the critical angle
D. when the angle of reflection is less than the critical angle

Answer 1

option b is correct

Answer 2

thank you so much none of this was on the tutorial