Question

Question 12
When light rays enter the eye, most of the refraction occurs at the

(a) crystalline lens
(b) outer surface of the cornea
(c) iris
(d) pupil

Answer 1

Option (b) is correct.
Most of the refraction in the eye takes place at the first surface, since the transition from the air into the cornea is the largest change in index of refraction which the light experiences. About $80\%$ of the refraction occurs in the cornea and about $20\%$ in the inner crystalline lens.