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