1. 3. A beam of light has been passed through a A beam of sunlight which has passed through a polarising filter and its irradiance is measured to be polariser and analyser is found to have a final 250 Wm-2. What is the irradiance value of the beam irradiance value of 188 Wm-. The filters are aligned after passing through an "analyser" filter which is at 60'. What was the irradiance value just before it aligned at an angle (to the polariser) of: hit the analyser filter? a) 450? b) 750? c) 2002 4. Outline the significance of Young's Experiment (1801) & Malus's Law (1809) on the understanding of the nature of light. 2. At what angle must a polariser & analyser be aligned for the irradiance of a beam of light to be reduced to exactly half of its max value