Why does dispersion of light is seen only in glass prism not in glass slab
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Explanation:
The dispersion is caused due to the the difference in the angle of deviation for different colours. In the case of a glass slab, the opposite sides are parallel and therefore different colors emerge parallel to each other and are seen simultaneously. Therefore, dispersion doesn't occur in a glass slab.
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Dispersion takes place only in a medium which have un-parallel surfaces.
As Glass Slab has parallel surface, no dispersion occurs.
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