Question

What‌ ‌is‌ ‌one‌ ‌important‌ ‌function‌ ‌of‌ ‌an‌ ‌electron‌ ‌gun?‌

Answer 1

We know that a cathode ray tube is a mechanically constructed device in which a curated beam of electrons is focused and made to hit another electrode, which can then be made to hit a photosensitive/electro sensitive screen or analyzed further to get different properties.

Complete answer:
Cathode ray tubes mainly consist of an electron gun, a screen, two or more electrodes and a glass casing and terminals to connect to the input and output sources. -In the electron gun assembly, the parts include a heater, filament and emitting electrode which acts as the cathode and two anodes, for accelerating and focusing the electron beam.
The electron gun is responsible for producing a fine beam of highly accelerated electrons that can be focused on the screen. The main function of the electron gun is to produce and accelerate the beam of an electron inside the vacuum tube of the CRT. Generating and accelerating the gun requires the heater, cathode electrodes, grid, and different types of anodes.
It is a device used in a cathode ray tube for displaying the image on the phosphor screen of CRT. The electron gun emits electrons and forms them into a beam with the help of a heater, cathode, grid, and pre-accelerating, accelerating and focusing anode.

Note:
Remember that the accelerating electrode must have a potential which is significantly larger than the potential of the cathode for the proper functioning of the gun. Also note that vacuum conditions must be maintained inside the tube, otherwise the electrons will hit the atoms present in air.