Question

For total internal reflection to occur, incidence angle must be greater than the critical angle.

• A. True
• B. False

Answer 1

The correct option is A

True

When incidence angle is equal to the critical angle, the refracted angle is ${90}^{\circ }$. As the angle of incidence increases further and becomes greater than critical anlgle, the ray instead of getting refracted, reflects back totally in the same medium undergoing Total Internal Reflection.