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

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By placing second (identical) prism in an inverted position with respect to the first prism a narrow beam of white light incident on one prism emerges out of the second prism as white light

Ray diagram, 

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Safeer PP

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