Dispersion is observed when light is passed through a Prism but no dispersion is observed when light is passed through a glass slab. why?
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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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because opposite faces of a glass slab are parallel to each other and prism does not has parallel faces so dispersion of light takes place in prism
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