In the prism, the wavelength of the light must change as well as the speed. Is a given wavelength longer or shorter inside the prism? Consider specifically light with a wavelength of 500 nm in air. What is the wavelength of this light inside the prism?
a) Longer inside the prism; Wavelength inside the prism is less than 500 nm.
b) Shorter inside the prism; Wavelength inside the prism is less than 500 nm.
c) Longer inside the prism; Wavelength inside the prism is greater than 500 nm.
d) Shorter inside the prism; Wavelength inside the prism is greater than 500 nm.