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| 1. |
Discuss about pile of plates. |
| Answer» Solution :The phenomemon of polarisation by reflection is used in the construction of PILE of plates. It consists of a number of GLASS plates placed one overthe other. The plates areincilined at an angle of `33.7^(@)(90^(@) - 56.3^(@))` to the axis of thetube. A beam of unpolarised light is allowed to FALL on the pile of plates along the axis of the TUBE. So the angle of incidence of light will be at `56.3^(@)` which is the polarising angle for glass. The vibrations perpendicular to the plane of incidence ae reflected at each SURFACE and thoseparallel to it are transmitted. The larger the number of surfaces, the greater is theintensityof the reflected plane polarised light. The pile of plates is used as a polarizer and alsoas an analyser. | |