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Question

When a white light passes through a prism, it seperates into colours.

A
three
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B
five
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C
seven
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D
nine
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Solution

The correct option is C seven
If a prism is placed in a room and a narrow beam of white light is allowed to fall on one of its refracting faces, it is found that light coming out from the other face of the prism is split into seven colors i.e violet, indigo, blue, green, yellow, orange and red.
The phenomenon of splitting of white light into its seven constituent colors is called dispersion of light.

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