How does refractive index \( (\mu) \) of a material vary with respe...

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How does refractive index \( (\mu) \) of a material vary with respect to wavelength \( (\lambda) \) ? A and \( \mathrm{B} \) are constants
\( \mathrm{P} \)
(A) \( \quad \mu=A+B \lambda^{2} \)
(B) \( \quad \mu=A+\frac{B}{\lambda^{2}} \)
W
(C) \( \quad \mu=A+B \lambda \)
(D) \( \quad \mu=\mathrm{A}+\frac{\mathrm{B}}{\lambda} \)
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