What happens to a white light ray when it passes through two prisms kept in inverted position with respect to each other?
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If the two prisms are kept upright, one after the other, the white light will be split into a spectrum of 7 colours by the first prism. ... However, if one of the prisms is inverted wrt the other, the dispersion will be nullified and final light will be white.
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It is first dispersed into seven colours while passing through first prism and is then it again goes back to white colour when passed through second prism which is inverted.
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