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
Ans. (b)
At the point when the light rays enters the eye through a thin membrane, it forms a transparent bulge on the front surface of the eyeball, called the cornea.
Most refraction in the eye happens when light rays travel through the cornea.
Therefore option (b) is correct