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No, it wouldn't work in a total vacuum(the glass bulb still contains
some gas). Then there are no surrounding molecules to get the vanes
moving, and any force from the photons is insufficient to move the vanes
against the resistance of the needle. If you had a frictionless bearing,
a highly intense light source, and a lot of time, the vane might turn
detectably.
Lets move to povray.off-topic. :-)
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