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Focal length of convex lens made up of f...

Focal length of convex lens made up of flint glass is 12 cm. It is placed in contnat with a concave lens made up of crown glass to remove chrmoatic aberration. If ratio of dispersive powers of flint of crown glass is `frac(3)(2)` then focal length of concave lens is

A

`-8 cm`

B

`-12 cm`

C

`- 15 cm`

D

12 cm

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