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| Recomposition of White Light |
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| In order to get white light from the dispersed light the prisms are arranged as shown in the diagram. |
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| Recombination of the seven colors of the dispersed white light to get white light is known as Recomposition of white light. |
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| Place a prism (P1) on a table and a screen behind it. Allow a narrow beam of light to be incident on the prism (P1). The white light gets dispersed and we obtain a band of seven colors on the screen. |
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| Recomposition of the Dispersed White Light |
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| Now remove the screen and place another prism P2 of the same material in the opposite direction. Place a white light screen behind P2. A spot of white light appears on the screen. Thus the second prism has recombined the dispersed light. |
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| The small droplets of rain water which remain suspended in air just after the rains act like a prism. When sunlight passes through these drops of rainwater, it gets dispersed and we see the seven colors of the rainbow. |
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