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Find out equivalent focal length of give...

Find out equivalent focal length of given lens combination.

A

`((R)/(mu_(1)-mu_(2)))`

B

`((2R)/(mu_(1)-mu_(2)))`

C

`((4R)/(mu_(1)-mu_(2)))`

D

`((R)/(mu_(1)+mu_(2)))`

Text Solution

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The correct Answer is:
A
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