Off by one minute!
As a first approximation, measure the angle off the drawing. Estimating by eye-ball, it's ~30 degrees. Tell me how I did.
It's not like nobody's had the problem before: duckduckgo.com/?q=traffic+light+prism
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.What the headline giveth, the last paragraph taketh away. -- Scott Ott
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