What happens to light after it strikes the retina?

Retina is made up of light sensitive cells. Those light sensitive cells are rods and cones. The rods and cons are responsible for vision at low level . they are two types of photo receptor. The rods are more sensitive then cons.     They are responsible for the detection of color and then  change  the  images into signals . The signals start traveling from brain to optic nerve.

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.

i need an image of the diagram