question_answer 29)

  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:

                  (B) When the light rays enters the eye through a thin membrane, forms the transparent bulge on the front surface of the eyeball, called the cornea. Most of the refraction for the light rays entering the eye occurs at this outer surface of the cornea.