Answer:
The structure and functioning of
human eye are as given below Cornea is transparent. It is responsible for, most
of the refraction of light rays towards the retina.
Iris: Iris is a dark, circular
muscular diaphragm behind the cornea. It gives the eye its colour.
It also controls the pupil size
and thus controls the amount of light entering the eye.
Pupil: Pupil is
surrounded by the iris. It regulates and controls the amount of light entering the
eye.
Retina The retina is the
innermost layer of the eye. It contains an outer pigmented layer and
an inner nervous layer which
contains the photo receptors (rods and cones). Cone cells are coned shaped and
rod cells are rod shaped.
Optic nerve The optic
nerve connects the eye to the brain. The nerve fibers carry impulses from the
retina to the visual cortex.
Eye lens The eye lens is
made up of a fibrous, jelly-like material. It is transparent and has biconvex
structure. It forms an inverted real image of the object on the retina and also
separates the aqueous and the vitreous humours.
Vitreous humour: Vitreous
humour is clear, semi-solid supporting the eye ball.
The eye lens forms an inverted
real image of the object on the retina which sends image-electric signals to
brain via the optic nerves. The brain reconstruct erect image of objects and
make us see as they are.
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