Question

In total internal reflection, the angle of incidence is ___ the critical angle.

• A. greater than
• B. less than
• C. equal to
• D. independent of

Answer 1

The correct option is A greater than

When a ray of light passes from a medium of higher optical density to a medium of lower optical density, the angle of incidence at which the angle of refraction becomes ${90}^{\circ }$ is the critical angle. If the angle of incidence is greater than the critical angle, the ray is reflected back to the same medium without undergoing refraction. This phenomenon is called total internal reflection.
Therefore, in total internal reflection, the angle of incidence is greater than the critical angle.