Friday, August 12, 2011

A question about photons and seeing?

Photons are fundamental particles. One place they come from is a star ... like our sun. As hydrogen atoms are fused together into helium atoms in the center of the sun, a photon is given off from that fusion. The photon takes a very long time to reach the surface (hundreds of thousands of year due to gravity), but once it reaches the surface, off it goes in some direction, one of which ends up in the direction of the Earth, down to an oak tree in your front yard that it bounces off of and enters your pupil to a receptor in the back of your eye which is jiggled by the wave like action of that photon. That along will billions of other photons jiggling your optics causes a signal which is carried by your optic nerve to the visual cortex of your brain which you interpret, hopefully as an oak tree.

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