Uhh.. ok a Question

[theblackalchemist]

I just didn't know where to post this.
1) When light enters our eye it strikes our retina and it is processed by the brain. but what happens to the light ? does it get reflected or is it converted or used up ?
I am just plain confused
PS sorry for my long absence, been too busy

[Boerseun]

When light enters your eyeball and strikes the retina, it does a lot of things, knocking electrons off their orbits on the atoms forming the molecules that make up the rods and cones of your retina. Basically, the photon 'disappears' through transferring energy to your retina. That energy flux is experienced by your eyeball as visual input. But the photon is gone, all that happened was that an incredibly small amount of energy from the nuclear fire that lit up the star you were looking at was transferred to your retina.

[ronthepon]

But what about a bulb running of nuclear power?

Anyway, light is not always absorbed. In some species, it's reflected a number of times as well. Like cat eyes...