Select the correct statements :
            I) There is no dispersion of light refracted through a rectangular glass slab
            II) Dispersion of light is the phenomenon of splitting of a beam of white light into its
                 constituent colours
            III) Dispersion of light occurs, because velocity of light in a material depends upon its colour.
            IV)The dispersive power depends only upon the material of the prism, but not upon the
                  refracting angle of the prism

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II, III and IV are correct

I, II and IV are correct

I, II and III are correct

All are correct

answer is D.

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Detailed Solution

There is no dispersion of light refracted through a rectangular glass slab,

Dispersion of light is the phenomenon of splitting of a beam of white light into its constituent

colours,

Dispersion of light occurs, because velocity of light in a material depends upon its colour.

The dispersive power depends only upon the material of the prism, but not upon the refracting angle of the prism

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