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much to my regret.  The diagram made were showing the equality of the [[image: hand drawn large "v" shape that is bisected in the middle and appears to be underlined]]angles of incidence & reflexion [image: hand drawn large "v" shape that is bisected in the middle and  underlined]]for what purpose I know not. [[image equilateral triangle with a line in the middle and a single line outside on the left and 3 lines on the right]] showing the seperation of the rays in passing through a prism [[image triangle on its side with 4 lines drawn through it and lines of reflected light proportionate to lower prism facet]]explained above [[image rectangle bisected in the middle with a line drawn through it at an angle and "L" under the triangle and to the left of the line]] showing refraction.
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