Optics Question 634

Question: A achromatic combination is made with a lens of focal length $ f $ and dispersive power $ \omega $ with a lens having dispersive power of $ 2\omega $ . The focal length of second will be

[RPET 1997]

Options:

A) 2 f

B) $ f/2 $

C) $ -f/2 $

D) ? 2 f

Show Answer

Answer:

Correct Answer: D

Solution:

$ \omega /f=-2\omega /f’\Rightarrow f’=-2f $



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