Question 38
Refraction of LightA ray incident on a glass prism undergoes minimum deviation when the
- A.incident angle is equal to the angle of refraction
- B.refraction angle equals 90°
- C.incident angle equals 90°
- D.incident angle is equal to the angle of emergence.
Show the answer and explanation
Answer: D (incident angle is equal to the angle of emergence.)
Explanation
At minimum deviation the ray passes through the prism symmetrically, so the angle of incidence equals the angle of emergence.