1. Set up the mirror or lens and object. The mirror or lens can be represented as a straight line in most cases.
2. Draw a line from the top of the object through the center of the mirror or lens.
3. Draw a line from the top of the object horizontal to the surface.
4. Draw a third line from the top of the object through the focal point and the mirror or lens.
This will not be shown.
5. Where a line meets the mirror or lens, draw another line comeing from that same spot:
The above is mostly from reading Bauer and Westfall, Chapters 32 and 33.
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