SATHEE: Optics Question 634

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 $2 ω$ . 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:

$ω / f = - 2 ω / f^{'} \Rightarrow f^{'} = - 2 f$

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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

Options:

Answer:

Solution:

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