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Image Formation - Ray Tracing Basics

Wherever two or more light rays from the same point on an object cross or seem to cross, an image gets formed.  For any given mirror or lens, you could pick any two rays from your object (the thing we are making the image of) and trace them out using a protractor and possibly some trig.  It turns out, that there are three rays that we can be absolutely sure of without the use of a...

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