draw structure of human eye label and explain all the functions
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see in attachment For diagram
There is a very thin transparent cover (membrane) on the human eye. This is called
cornea (fig 7.11). Light enters the eye through it. Maximum amount of incident light is
re* acted inside the eye at the outer surface of the cornea. There is a dark, fleshy screen
behind the cornea. This is called the Iris. The colour of the Iris is different for different
people. There is a small hole of changing diameter at the centre of the Iris which is called
the pupil. The pupil controls the amount of light entering the eye. If the light falling on the
eye is too bright, pupil contracts while ifthe light is dim, it widens. On the surface ofthe iris,
there is bulge of transparent layers. There is a double convex transparent crystalline lens,
just behind the pupil. The lens provides small adjustments of the focal length to focus the
image. This lens creates real and inverted image of an object on the screen inside the eye.
mis screen is made of light sensitive cells cmd is called the retina. These cells get
excited when light falls on them and genernte electric signals. These signals are conveyed
to the brain thTough optic nerve. Later, the brain analyses these signals and converts them
in such a way that we perceive the objectsmwa qtually are.
