Optics Question 700

Question: If the focal length of a double convex lens for red light is $ f _{R}, $ its focal length for the violet light is

[EAMCET 2005]

Options:

A) $ f _{R} $

B) Greater than $ f _{R} $

C) Less than $ f _{R} $

D) $ 2f _{R} $

Show Answer

Answer:

Correct Answer: C

Solution:

$ f\propto \frac{1}{\mu -1} $ and $ \mu \propto \frac{1}{\lambda } $ .



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