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 (i) `n_1 gt n_2` (ii) `n_1 = n_2` (iii) `n_1 lt n_2`.

Explanation

(i) When `n_1 gt n _2`, light goes from rarer to denser medium. Therefore, on passing through a concave lens, it diverges,

(ii) When `n_1 = n_2`, there is no change in medium. Therefore, no bending or refraction occurs as shown

(iii) When `n_1 lt n_2`, light goes from a denser to a rarer medium. Therefore, in passing through a concave lens, it converges