A brightly polished Zinc plate on an electroscope is negatively charged. When lit with the Hg vapour lamp, the electroscope discharges again. The plate is not discharged if a glass sheet is held between the lamp and zinc plate or the electroscope is pos ...
Principle
The focal lengths of unknown lenses are determined by measuring the distances of image and object and by Bessel's method. Simple optical instruments are then constructed with these lenses.
Tasks
Monochromatic light falls on a plane parallel mica plate. The light rays, reflected at the front surface as well as at the rear surface, will interfere to form a pattern of concentric rings. The radii of the rings depend on the geometry of the experimental setup, th ...
Linear polarized light passes through a polarization filter. Transmitted light intensity is determined as a function of the angular position of the polarization filter.
Optically active substances cause very slight rotations of the light polarisation plan, which the method of crossed polarisation filters is not strong enough to measure. With this method, the direction of polarisation of the analyser is perpendicular ...
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