Q. A ray of light falls on the surface of a spherical glass paper weight making an angle $\alpha$ with the normal and is refracted in the medium at an angle $\beta$. The angle of deviation of the emergent ray from the direction of the incident ray
A) $(\alpha - \beta)$
B) $2(\alpha - \beta)$
C) $(\alpha - \beta)/2$
D) $(\beta - \alpha)$
Explanation
(b) From the following ray diagram it is clear that
$\delta = (\alpha - \beta) + (\alpha - \beta) = 2(\alpha - \beta)$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.