Dispersion of light is due to

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(A) Dispersion of light is the phenomenon of splitting of white light into its constituent colors when it passes through a prism.This occurs because t

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Wavelength

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(A) Dispersion of light is the phenomenon of splitting of white light into its constituent colors when it passes through a prism.This occurs because the refractive index of the material of the prism depends on the wavelength of the light.According to Cauchy's formula,the refractive index $n$ is related to the wavelength $\lambda$ by $n(\lambda) = A + B/\lambda^2 + C/\lambda^4 + \dots$.Since different colors have different wavelengths,they travel at different speeds in the medium and undergo different amounts of deviation,leading to dispersion.Therefore,the correct option is $A$.

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