Why we place second prisminverted?

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Yogita Ingle 5 years, 10 months ago
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. It will further be diverged by the second prism as the dispersion caused by both the prisms are in the same directions. However, if one of the prisms is inverted wrt the other, the dispersion will be nullified and final light will be white.
Both the prisms are kept in the same direction, either upright or inverted.
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