129) Unpolarized light with intensity I0 is incident on two polarizing filters. The axis of the first filter makes an angle of 60.0^??with the vertical, and the axis of the second filter is horizontal. What is the intensity of the light after it has passed through the second filter

130) A parallel beam of unpolarized light in air is incident at an angle of 54.5I₀?(with respect to the normal) on a plane glass surface.The reflected beam is completely linearly polarized. What is the refractive index of the glass?