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. n1<n2 iii. n1>n2
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Answer 1

A concave lens made of a material or refractive index n1 is kept in a medium of refractive index n2 A parallel beam of light is incident on lens. Trace tha path of light parallel to principal axis incident on concave lens after refraction when: n1>n2. n1=n2.Mar.

Answer 2

1. in first situation light will not bend even a bit due to equal refractive index
2. if the lens is like first n1 and then n2 then it will bend as shown
3. same in 3rd shown above