Total internal reflection occurs when the angle of incidence

Total internal reflection complete reflection of a ray of light within a medium such as water or glass from the surrounding surfaces back into the medium. The phenomenon occurs if the angle of incidence is greater than a certain limiting angle, called the critical angle.

Total internal reflection, in physics, occurs if the angle of incidence is greater than a certain limiting angle, called the critical angle.

Explanation:

Total internal reflection, in physics, occurs if the angle of incidence is greater than a certain limiting angle, called the critical angle.