(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