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by elenzil
Wed Oct 19, 2011 4:51 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0964: "Dorm Poster"
Replies: 155
Views: 43599

doing it w/o lenses

the original beam can be reconstructed without the use of lenses, with some caveats. not shown in the Pink Floyd poster is a secondary rainbow exiting the prism after reflecting internally from the spot where the primary rainbow exits. this secondary beam however is parallel rather than expanding. i...

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