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A 20 cm convex lens is placed in contact...

A `20 cm` convex lens is placed in contact with a diverting lens of unknown focal length ,The lens combination acts as a converging lens and has a length of`30 cm`.What is the focal length of the diverging lens.

A

`- 10 cm`

B

`- 30 cm`

C

`- 60 cm`

D

`- 90 cm`

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