Question

The angle through which the incident ray is deviated by the prism is called the angle deviation.

• A. True
• B. False

Answer 1

The correct option is A True

The angle of deviation through a triangular prism is defined as the angle between the incident ray and the emerging ray $\left(angle\delta \right)$. It can be shown that when the angle of incidence $i$ is equal to the angle of refraction $r$' for the emerging ray, the angle of deviation is at a minimum.