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Question

When we place a glass prism in the path of a narrow beam of white light a spectrum is obtained. What happens when a second identical prism is placed in an inverted position with respect to the first prism? Draw a labeled ray diagram to illustrate it.

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Solution

The first prism disperses white light into its seven constituent colors and forms the spectrum. The other inverted prism recombines all the seven colors and gives a white light.


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