Explanation
Vidicon is basically VID (eo) + ICON (oscope). It is a small television camera tube that forms a charge density image on a photoconductive surface for subsequent electron-beam scanning.
In an electric field, a force opposite to the direction of electric field acts on negatively charged particles (i.e., from lower potential to higher potential).
Charged particles trace a circular path in a perpendicular magnetic field.
Light consists of photons and cathode rays consists of electrons. However both effect the photographic plate.
Higher the voltage, higher is the KE. Higher the work function, smaller is the KE.
Cathode rays are beam of electrons.
The colour of the positive column in a discharge tube depends on the type of gas e.g., for air, colour is purple red, for H2 colour is Blue etc.
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