Stanton D. answered • 02/28/22
Tutor to Pique Your Sciences Interest
Hi Shami K.,
it would be wrong to state that " bending of light is maximum at the center of the eye lens". The bending of a ray of light is a function of the angle of passage through surfaces or layers of differing refractive index. If a ray of light passes through the exact center of the eye lens, it is NOT bending at all there, because there is no gradient of optical refractive index there (it is a local maximum there). So: yes, there is a gradient of refractive index in the lens, and the index is a maximum in the central layers of the lens. Even so, that's a minor effect (nD = 1.386 surface to 1.406 center) compared with the curved interface lens-to-aqueous_humor (nD=1.336).
Now, what the question was intended to get you to recognize was, that the body has increased the focusing power of the lens slightly by that structural composition.
Bending of a ray of light is always greatest for a ray passing near the edge of a lens. Always!
--Cheers, --Mr. d.
