Optics Question 605

Question: Focal length of a convex lens will be maximum for

[MP PMT 1994]

Options:

A) Blue light

B) Yellow light

C) Green light

D) Red light

Show Answer

Answer:

Correct Answer: D

Solution:

$ f\propto \frac{1}{(\mu -1)} $ and $ \mu \propto \frac{1}{\lambda } $ . Hence $ f\propto \lambda $ and $ {\lambda _{r}}>{\lambda _{v}} $



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