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A achromatic combination is made with a ...

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

A

`2 f`

B

`f//2`

C

`-f//2`

D

`-2 f`

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The correct Answer is:
d
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