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Focal length of two lens arefandf^(')and...

Focal length of two lens are`f`and`f^(')`and dispersive powers are `omega_(0) `and `2omega_(0)`.To form achromatic combination from these-
(1)`f^(')=2f ,(2) f^(')=-2f` (3)`f^(')=-f//2`

A

`f'=2f`

B

`f'=-2f`

C

`f'=f//2`

D

`f'=-f//2`

Text Solution

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The correct Answer is:
B
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