Given below are two statements :Statement I : | vedclass

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(A) According to Cauchy's equation,the refractive index $\mu$ of a medium depends on the wavelength $\lambda$ as $\mu(\lambda) = A + B/\lambda^2 + ...

Vedclass · Accepted Answer

Both Statement $I$ and Statement $II$ are true.

Vedclass · Answer

(A) According to Cauchy's equation,the refractive index $\mu$ of a medium depends on the wavelength $\lambda$ as $\mu(\lambda) = A + B/\lambda^2 + ...$. Since $\lambda_{	ext{red}} > \lambda_{	ext{yellow}} > \lambda_{	ext{violet}}$,the refractive index for red light is the smallest,and for violet light,it is the largest.For a thin prism,the angle of deviation $\delta = (\mu - 1)A$. Since $\mu_{	ext{red}} Thus,Statement $I$ is true.Statement $II$ is also true because the refractive index of a dispersive medium varies with wavelength,which is the fundamental cause of dispersion.

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