Question

A concave lens made of a material of refractive index $n_1$ is kept in a medium of refractive index $n_2$. A parallel beam of light is incident on the lens. Complete the path of rays of light emerging from the concave lens if:
(a) $n_1>n_2$ and (b) $n_1<n_2$.
[5 MARKS]

Answer 1

Each subpart: 2.5 Marks each

(a) In this case, light travels from a rarer medium to a denser medium. Hence, the rays of light will diverge after passing through the concave lens.

(b) In this case, light travels from a denser medium to a rarer medium. Hence, the rays of light will converge after passing through the lens.