Asunset appears red because a. scattering is prevented by small particles. b. it travels through less atmosphere. c. most of the blue and green has been redirected. d. it travels a short distance. e. none of the above

In a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. what should be the radius of curvature of the cornea such that the image of an object 40.0 cm from the cornea’s vertex is focused on the retina?