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  4. The refractive index of glass is 1.5 for light waves of λ = 6000 mathringA in vacuum. Its wavelength in glass is

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Q. The refractive index of glass is $1.5$ for light waves of $\lambda = 6000 \,\mathring{A}$ in vacuum. Its wavelength in glass is

Wave Optics

Solution:

$\mu = \frac{c}{v} = \frac{\lambda_{v}}{\lambda_{g}} $
$ \therefore \lambda_{g} = \frac{\lambda_{v}}{\mu} $
$ =\frac{6000}{1.5} = 4000 \mathring{A}$