Q. Focal length of a convex lens will be maximum for
A) Blue light
B) Yellow light
C) Green light
D) Red light
Explanation
(d) $f = \frac{1}{(\mu - 1)}$ and $\mu \propto \frac{1}{\lambda}$. Hence $f \propto \lambda$ and $\lambda_{r} > \lambda_{v}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.