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The dispersive powers of crown and flint...

The dispersive powers of crown and flint glasses are `0.02` and `0.04` respectively. In an achromatic combination of lenses the focal length of flint glass lens is `40 cm`. The focal length of crown glass lens will be

A

`- 20 cm`

B

`+ 20 cm`

C

`- 10 cm`

D

`+ 10 cm`

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The correct Answer is:
a
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