#2991: Beamsplitters
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[Cross section of a telescope with some parts of the image darkened to represent the path of light, with portions where the light would be more concentrated being darker]
[Labels with arrows as they appear left to right, top to bottom:]
Incoming Light
Primary Mirror
Secondary Mirror
Beamsplitter
Sensor
Secret Solar Panel
Power Sold To Grid
[Caption below the panel:]
Astronomy News: The International Astronomical Union has finally banned beamsplitters, optical devices used by scientists to embezzle light from their instruments.
(Sourced from explainxkcd.com)
Title text:Under quantum tax law, photons sent through a beamsplitter don't actually choose which path they took, or incur a tax burden, until their wavefunction collapses when the power is sold.