why wooden box in Newton's ring experiment is coated black from inside
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The solid-color disks are slotted, and my be overlapped, as
in the case of the black/white and red/blue disks at the left. The concentric
and conjoined disks may then be slid around to vary the relative amount of
each color. Three disks can also be put together to produce the illusion
of white when they are spinning.
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