The refractive index of the material of a concave lens is `n`. It is immersed in a medium of
Channel: Doubtnut
Date: 2020-08-02

The refractive index of the material of a concave lens is `n`. It is immersed in a medium of refractive index `n_(1)`. A paprallel beam of light  is incident on the lens. Trace the path of emerged rays in each of the following cases :  (a) `n_(1) gt n` (b) `n_(1) lt n` ( c) `n_(1) = n`.