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A convex lens of focal length f1 is put ...

A convex lens of focal length `f_1` is put in contact with concave lens of focal length `f_2`. The combination which will behave as a converging lens is :

A

`f_1gtf_2`

B

`f_1=f_2`

C

`1/f_1gt1/f_2`

D

`f_1=1/f_2`.

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