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The first factor length f(1) for refract...

The first factor length `f_(1)` for refraction at a spherical surface is defined as the value of u corresponding to `v=oo` (as shown) with refractive indices of two mediums, as `n_(1)` and `n_(2)`. The second focal length `f_(2)` is defined as value of v for `u=oo`.

A

`f_(2)` is equal to `(n_(2)R)/((n_(2)-n_(1)))`

B

`f_(1)` is equal to `(n_(2)R)/((n_(2)-n_(1)))`

C

`f_(2)` is equal to `(-)(n_(1)R)/((n_(2)-n_(1)))`

D

`f_(1)` is equal to `(n_(1)R)/((n_(2)-n_(1)))`

Text Solution

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The correct Answer is:
C, D
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