ABSTRACT
A slit source, placed in the focal plane of a lens, gives a parallel beam of light. This light beam falls on a screen having a narrow slit parallel to the source. The positions of the objective and of the photocathode of the camera are adjusted by trial and error so as to obtain a good image of the slit source on the television screen. The width of the slit source must be increased till the phenomenon is properly visible. A point source placed at the object focus of a lens gives a parallel beam of rays. The photocathode of the camera lies in the focal plane. In order to be able to use the camera in the horizontal position, a total reflection prism or a mirror is placed immediately after the eyepiece of the microscope to send the beam in the horizontal direction.
