Singlemode fibre optics employs a single beam which transmits parallel to the fibre internally. i.e. direct light.
Multimode employs lots of different angles and light frequencies that bounce off the internal sides of the optical fibre i.e dispersed light. Multimode used thicker optical fibre cable.
At a certain length multimode operation should expire leaving only direct light and return to singlemode albeit reduced power.
The party straws no doubt will operate like lots of single mode fibres and allow for a shorter snoot.
Please find below diagram showing single and multimode fibres (its in french)
I'll get me some straws and do my own experiment.
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