why there is no dispersion in white light refracted through a rectangular glass slab?
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After refraction at two parallel faces of a glass slab, a ray of light emerges in a direction parallel to the direction of incidence of white light. As rays of all colours emerge in the same direction, i.e., the direction of the incidence of white light, there is no dispersion.
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1
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After refraction at two parallel faces of a glass slab, a ray of light emerges in a direction parallel to the direction of incidence of white light on the slab. As rays of all colours emerge in the same direction ( of incidence of white light ), hence there is no dispersion, but only lateral displacement.
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