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(15 marks) Suppose a ray comes from a point (2, 8) and hits at mirror point (6, 6). Assume that perpendicular vector a point (6, 6) is ̅= (0, 3). Find the reflection emitting point from (6, 6).

[Assume 2-D coordinate system, you must draw the appropriate diagram of your solution]

I'm pretty sure I can figure out the diagram, but I can't figure out what information I've been given and what is left for me to calculate. I can't draw a diagram that makes sense with what is being described. Does anyone know what I'm being asked here?

Kaleb
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1 Answers1

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IMO the question is about a trick to handle reflections: rather than computing the direction of the incoming ray and deriving the direction of the outgoing ray, you can construct the symmetric of the emission point wrt the mirror. Then the reflected ray is the line from the reflected point through the hitting point.

enter image description here