A convex lens of focal length 10 cm is p...

A convex lens of focal length 10 cm is placed in contact with a concave lens of focal length 20 cm. The focal length of this combination of lenses will be:

A

`+10 cm`

B

`+20 cm`

C

`-10 cm`

D

`-20 cm`

Text Solution

Verified by Experts

The correct Answer is:

B

b

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