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What is a ray diagram? What is the minimum number of rays needed to draw a...

What is a ray diagram? What is the minimum number of rays needed to draw a ray diagram. In your answer be sure to address the following for concave and convex mirrors:

a) What happens to rays that are parallel to the principle axis and are reflected at the mirrors surface?

b) What happens to rays that travel on trajectories that would take them through the focal point?

c) What happens to rays that travel on trajectories that would take them through the radius of curvature?

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