The structure of the eye which serves to refract and focus light rays upon retina is called -

Correct option is D

The correct answer is (d) Lens.
· The lens of the eye serves to refract and focus light rays upon the retina. It is a transparent, flexible structure located behind the iris and pupil, which changes its shape to focus light from objects at various distances onto the retina, enabling clear vision.
Information Booster:
· Iris : The colored part of the eye that controls the size of the pupil.
· Cornea : The transparent, curved front surface of the eye that helps to focus light onto the retina but does not change shape like the lens.
· Pupil : The opening in the center of the iris that regulates the amount of light entering the eye.