<prompt> Most important factor determining convergence of light rays on the retina isLength of eyeballRefractive index of corneaDioptre power of lensPhysical state of vitreous  <response>: refracting structures with their refractive indices given in parentheses-cornea 1.37, the aqueous humour 1.33, the crystalline lens 1.42, and the vitreous humour 1.33.The total dioptric power of the eye is about 60 D out of which about 44 D is contributed by the cornea and 16 D by the crystalline lens. 