Question

A convex lens of focal length 10 cm is combined with a concave lens of focal length 20 cm to form an achromatic combination. The convex lens is made of a material of dispersive power 0.016. The dispersive power of the material used for concave lens is 

A

0.022

B

0.042

C

0.032

D

0.052

Easy
Solution
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Correct option is C)

For achromatic aberration:





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