<prompt> Most important factor determining convergence of light rays on the retina is :Length of the eyeballRefractive power of the lensCurvature of the corneaPhysical state of the vitreous  <response>: Ans. c Curvature of the corneaRef: Optics of the human eye, p. 15-20Cornea is the most important refracting medium responsible for convergence of light rays to the retina because of its curvature and difference in refractive index from air to cornea. 