Question A4 A light source produces a beam of unpolarised light of intensity 20 W m This is incident on one ideal linear polariser with transmission axis vertical, then a second ideal linear polariser with transmission axis at 30 degrees from the vertical, and then a third ideal polariser with axis at 60 degrees from the vertical (in the same direction as the second). Calculate the intensity transmitted after the third linear polariser, and write down the polarisation state.

Question A4 A light source produces a beam of unpolarised light of intensity 20 W m This is incident on one ideal linear polariser with transmission axis vertical, then a second ideal linear polariser with transmission axis at 30 degrees from the vertical, and then a third ideal polariser with axis at 60 degrees from the vertical (in the same direction as the second). Calculate the intensity transmitted after the third linear polariser, and write down the polarisation state.