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Two thin lenses, aone convex of focal le...

Two thin lenses, aone convex of focal length 10 cm and other concave lens are kept in contact to form a composite lens of focal length 13 cm . If the combination acts as a converging lense the focal length of second lens is

A

`-43.33` cm

B

`-6.65 cm`

C

`+5.65 cm`

D

`+43.33 cm`

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The correct Answer is:
A
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