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Why is there no dispersion of light refr...

Why is there no dispersion of light refracted through a rectangular glass slab?

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For a thin prism `delta=(mu-1)A`
In case of a rectangular slab A=0
`impliesdelta=0`
`:.` Rays of all the colours emerge in the same direction, parallel to incident light. Hence there is no dispersion of light passing through a rectangular glass slab.
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