Why does the eye-lens not have to do all the work of converging incoming light rays?
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All the work of converging incoming light is not done by eye lens because most of the light convergence is already done by cornea.
Cornea is a part of eye, whose diameter measures 12 mm horizontally, and the vertical measurement of diameter is 11mm.
Cornea functions by providing 75% of the focusing power of the eye. Most of the eye defects like long sightedness, short sightedness are due to problems in cornea.
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