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The refractive index of the material of ...

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`.

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