Q. The refractive index of glass is 1.520 for red light and 1.525 for blue light. Let $D_{1}$ and $D_{2}$ be angles of minimum deviation for red and blue light respectively in a prism of this glass. Then ,
A) $D_{1} < D_{2}$
B) $D_{1} = D_{2}$
C) $D_{1}$ can be less than or greater than $D_{2}$ depending upon the angle of prism
D) $D_{1} > D_{2}$
Explanation
(a) $D = (\mu - 1)A$
For blue light $\mu\ $is greater than that for red light, So $D₂ > D₁$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.