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The refractive index of a converging len...

The refractive index of a converging lens is 1.4. What will be the focal length of this lens if it is placed in a medium of same refractive index? Assume the radii of curvature of the faces of lens are `R_(1) and R_(2)` respectively.

A

Zero

B

1

C

Infinite

D

`((R_(1)R_(2))/(R_(1)-R_(2)))`

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