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Experiment to Show the Recomposition of White Light
Set up a prism (P ) on a table with a screen behind it. Allow a narrow beam of light
1
to strike the prism (P ). The white light is dispersed, resulting in a seven-color band
1
on the screen.
Remove the screen and replace it with another prism P2 of the same material
oriented in the opposite direction. Put a white screen in front of P2. A white light
spot appears on the screen. As a result, the dispersed light has been recombined by
the second prism.
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