A tutorial sheet of polarisation problems is given below
- When is a beam of light polarised?
- A beam of unpolarised light of intensity 4000 Wm-2 strikes a polarising filter. What is the transmitted intensity?
- Unpolarised light of intensity I passes through three polarising filters placed in a line. The polarising directions of the filters are are inclined at 45° to each other. Determine the intensity transmitted by the third filter.
- Polarised light of intensity I passes through three polarising filters placed in a line. The angle between the plane of polaristion of the light and the polarising direction of the first filter is 45°. If the polarising directions of the filters are inclined at 45° to each other, determine the intensity transmitted by the third filter.
- Light is polarised with its electric field in the horizontal plane. The light strikes two polarising filters, one behind the other. The first filter has its polaring direction at 25° to the horizontal and the second at 50° to the horizontal. What percentage of the intensity of the original light passes through the second filter?