Question

9-4 Figure Q9-2 shows a diagram of the human eye. The refractive indices of the components in the light path are: cornea 1.38, aqueous humor 1.33, crystalline lens 1.41, and vitreous humor 1.38. Where does the main refraction-the main focusing-occur? What role do you suppose the lens plays? Figure Q9-2 Diagram of the human eye (Problem 9-4) iris humor retina corne lens aqueous humor

Answer 1

About 80% of the refraction or focusing occurs in the cornea and 20% of the refraction occurs in the inner crystalline lens.

The function of the lens in the human eye is to focus the light onto the retina, so that the picture is clear.