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A lens made from a material of absolute ...

A lens made from a material of absolute refractive index `n_1` is placed in a medium of absolute refractive index `n_2`. The focal length `f` of the lens is related to `n_1` and `n_2` as :

A

`f prop (n_1-n_2)`

B

`f prop 1/(n_1-n_2)`

C

`f prop (n_1+n_2)`

D

`f prop 1/(n_1+n_2)`.

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