Which of the following is necessary for total internal reflection to occur?

Question

Group of answer choices

the angle of incidence must be equal to the critical angle

the angle of incidence must be smaller than the critical angle

the angle of incidence must be exactly half the critical angle

the angle of incidence must be greater than the critical angle

Answer 1

Total internal reflection occurs when the angle of incidence is greater than the critical angle. Therefore, the correct choice is:

the angle of incidence must be greater than the critical angle.