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How will you use two indentical prisms s...

How will you use two indentical prisms so that a narrow beam of white light incident on one prism emerges out of the second prism as white light ? Draw the diagram.

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A narrow beam of white light incident on one prism emerges out of the identical prism placed in an inverted position with respect to the first prism close to the first prism as shown in figure given below.
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