Question

A monochromatic light ray with the wavelengths of 600nm disperses in glass with a refractive index of 1.5. Find the wavelength of the light ray in the glass

Answer 1

We know that

$\lambda=600nm\\\mu=1,\mu'=1.5$

$\lambda\alpha\frac{1}{\mu}$

Now

$\frac{\lambda}{\lambda'}=\frac{\mu'}{\mu}$

$\lambda'=\frac{\mu}{\mu'}\times\lambda$

$\lambda'=600\times10^{-9}\times\frac{1}{1.5}=400nm$