Question

A concave lens made of material of refractive index n2 is held in reference
medium of refractive index n1. Trace the path of parallel beam of light
passing through the lens when i.n1=n2 ii. <n2 ii. n1>n2​

Answer 1

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Answer 2

(a) In this case, n1 > n2, i.e. medium of concave lens is denser than the medium from where light ray

is incident on it. Therefore, at entering surface, the light ray bends towards the normal N1, while leaving the lens, the ray again goes under refraction at leaving surface and in this situation it bends away from the normal N2.

(b) In this situation, light ray parallel to principal axis goes straight without any deviation as n1 =n2