Sunday, 12 April 2015

interference - Photon-Photon Interactions


Every second there are photons flying in all directions in front of me, a vast majority of which are invisible to me as they just don't happen to strike the cornea of my eye.


Why don't any of these photons interfere? If they behaved like particles, wouldn't they collide and be obstructed from their original straight paths? If they behaved like waves, wouldn't they interfere constructively and destructively? Why can't I see the results of these interactions?


If I have a red block a fixed distance directly in front of me, and one source of light lighting up the room directly above me (which is a coherent source of light), wouldn't there be points on the cylinder which appear black to me because of destructive interference with other points on the block?




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