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Q.

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

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a

$\frac{f}{2}$

b

2 f

c

-2f

d

$- \frac{f}{2}$

answer is D.

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Detailed Solution

$\frac{ω}{f} = \frac{2 ω}{f'} \Rightarrow f' = - 2 f$

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