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Two thin convex lenses of focal lengths ...

Two thin convex lenses of focal lengths `f_(1)` and `f_(2)` are in contact and coaxial. The power of the combination is

A

`sqrt((f_(1))/(f_(2)))`

B

`sqrt((f_(2))/(f_(1)))`

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
D
The focal length (F) of the combination of two convex lenses in close contact is given by
`(1)/(F) =(1)/(f_(1))+(1)/(f_(2))=(f_(1)+f_(2))/(f_(1)f_(2)) and (1)/(F) =P`
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