It is desired to make an achromatic comb...

It is desired to make an achromatic combination of two lenses, `(L_(1)& L_(2))` made of materials having dispersive power `omega_(1)` and `omega_(2)(ltomega_(1))`. If the combination of lenses is converging then:

A

25 cm and 50 cm

B

50 cm and 25 cm

C

50 cm and 100 cm

D

100 cm and 50 cm

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The correct Answer is:

A

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