Fact 1: When light enters the eye through the pupil , that light falls on the retina.

Fact 2: Intermediate length rays are visible as light.

Given the two facts above, answer the question "what enters the eye through the pupil and falls on the retina?" with the following options: 
- an electron microscope
 - rain or sun shine
 - iris
 - rods and cones
 - an electron lens
 - Chemical energy
 - intermediate length rays
 - hydrogen


 

       intermediate length rays  