explain the working of eye.
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The iris (the colored portion of the eye that surrounds the pupil) opens and closes, making the pupil bigger or smaller. This regulates the amount of light passing through. ... The retina, which sits at the back of the eye, is a thin layer of tissue that contains millions of tiny light-sensing nerve cells.
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in the normal the eye,light rays come to sharp focussing point on the retina..
the retina functions much like the film
- in a camera the retina recieves this image that the cornea focusses through the eye's internal lens
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