Alight wave moves from a medium where particles of matter are closely packed to a medium made of very little matter. how do you expect the light wave to travel differently?
the light will change wavelength and lose energy.
the wavelength will change along with the frequency.
the wave will move faster, increasing its speed.

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.