Quote:
Originally Posted by glend
It is about the angle of incident, and angle of reflection, the ray does not have to be perpendicular to the mirror ( these mirrors are not flat). You can demonstrate this with a ray diagram, or a ray string trace running from the edge of the mirror to the opening of the tube on the opposite side. With parabolic mirrors the angle of reflection will be towards the secondary.
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Jason should draw us one of his cool raytrace diagrams to illustrate.