Optics Question 634

Question: A achromatic combination is made with a lens of focal length f and dispersive power ω with a lens having dispersive power of 2ω . 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:

ω/f=−2ω/f′⇒f′=−2f

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