A medium is said to be dispersive,if | vedclass

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(A) Dispersion occurs because the refractive index of a medium depends on the wavelength of light. Since the refractive index $n$ is related to the sp

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Light of different wavelengths propagate at different speeds

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(A) Dispersion occurs because the refractive index of a medium depends on the wavelength of light. Since the refractive index $n$ is related to the speed of light $v$ in the medium by $n = c/v$,where $c$ is the speed of light in a vacuum,a variation in refractive index for different wavelengths implies that light of different wavelengths propagates at different speeds in the medium. For example,in glass,the refractive index for red light is lower than that for violet light,meaning red light travels faster than violet light. Therefore,the correct condition for a medium to be dispersive is that light of different wavelengths propagates at different speeds.

$A$ medium is said to be dispersive,if

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