Physics

Problem

A laser emits light of wavelength

500\,\text{nm}

in air where its speed is

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

. The light enters an oil in which its speed is

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

. What is the wavelength of the light in the oil? a)

500\,\text{nm}

333\,\text{nm}

222\,\text{nm}

750\,\text{nm}