A biconvex lens made of material with refractive index `n_(2)`. The radii of curvatures of its
Channel: Doubtnut
Date: 2021-11-10

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 to