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A plano- convex lens fits exactly into a...

A plano- convex lens fits exactly into a plano- concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices `mu_(1)` and `mu_(2)` and R is the radius of curvature of the curved curface of the lenses, then the focal length of the combination is

A

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

B

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

C

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

D

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

Text Solution

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The correct Answer is:
B
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AAKASH INSTITUTE ENGLISH-RAY OPTICS AND OPTICAL INSTRUMENTS-ASSIGNMENT (SECTION - C)
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