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Two thin lenses of focal lengths f(1) a...

Two thin lenses of focal lengths ` f_(1) and f_(2)` are placed in contact. The focal length of the composite lens will be

A

`( f_(1) + f_(2))/( 2)`

B

` ( f_(1) + f_(2))/( f_(1) f_(2))`

C

` sqrt( f_(1) f_(1))`

D

` ( f_(1) f_(2))/( f_(1) + f_(2))`

Text Solution

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The correct Answer is:
D
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