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When two lenses of focal lengths f1 and ...

When two lenses of focal lengths `f_1` and `f_2` are placed in contact with each other then they acts a lens with equivalent focal length

A

`f_(eq)=f_1+f_2`

B

`1/f_(eq)=1/f_1- 1/f_2`

C

`abs(f_1-f_2)=f_(eq)`

D

`1/f_1 + 1/f_2=1/f_(eq)`

Text Solution

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The correct Answer is:
D
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