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Why does the eye-lens not have to do all the work of converging incoming light rays?
The eye-lens does not have to do all the work of converging incoming light rays because the cornea, which is the front part of the eye is convex in shape, due to which it also converges the light rays entering the eye.
Explanation
Cornea is the front part of the eye-bulging outwards, which is made of a transparent substance, and the outer surface of the cornea is convex in shape. Because of this shape, when the light rays coming from an object enter the eye through the cornea, it just bends or refracts.
Most of the refractive power in the eye comes from the cornea, because of the differences in the indices of refraction between the air (refractive index of about 1.00) and the aqueous humor, which has an index of refraction of 1.34. Around 80% of refraction occurs in the cornea and around 20% in the inner crystalline lens.
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