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A biconvex lens made of material with refractive index `n_(2)`. The radii of curvatures of its left surface and right surface are `R_(1)` and `R_(2)`. The media on its left and right have refreactive indices `n_(1)` and `n_(3)` respectively. The first and second focal lengths of the lens are respectively `f_(1)` and `f_(2)`. The ratio, `f_(1)//f_(2)`, of the two focal lengths is equal toA. `n_(1)//n_(3)`B. `(n_(1) - 1)//(n_(3) - 1)`C. `(n_(1) + 1)//(n_(3) + 1)`D. `(n_(2) -n_(3))//(n_(2) - n_(1))` |
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Answer» Correct Answer - A |
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