Physics

Problem

Monochromatic light of wavelength

500\,\text{nm}

in air first enters medium X where its speed is

2.0\times10^{8}\,\text{m s}^{-1}

and then passes into medium Y where the speed becomes

1.8\times10^{8}\,\text{m s}^{-1}

. What is the wavelength of this light in medium Y? a)

450\,\text{nm}

333\,\text{nm}

300\,\text{nm}

556\,\text{nm}