A beam of light that is vertically polarised and has intensity $I_0$ is incident normally on a polarising filter. The filter’s transmission axis makes an angle of $45^{\circ}$ to the vertical. The light that passes through this filter then falls normally on a second filter. The transmission axis of the second filter is horizontal. What is the intensity of the beam of light after it has passed through the second filter?
- A$0$
- B$\frac{1}{4} I_0$
- C$\frac{1}{2} I_0$
- D$I_0$