The image in a classic television set is created by focused beam of electrons deflected by electric or magnetic fields in cathode ray tubes (CRTs).Д¬athode rays are so named because they are emitted by the negative electrode, or cathode, in a vacuum tube. Electrons were first discovered as the constituents of cathode rays. If an evacuated glass tube is equipped with two electrodes and a voltage is applied, the glass opposite the negative electrode is observed to glow from electrons emitted from the cathode. cathode raysStreams of electrons observed in vacuum tubesД¬athode rays (also called an electron beam or an e-beam) are streams of electrons observed in vacuum tubes.crookes tubeAn early experimental electrical discharge tube, invented by English physicist William Crookes and others around 1869-1875, in which cathode rays, streams of electrons, were discovered.Thomson used the cathode ray tube to determine that atoms had small negatively charged particles inside of them, which he called 'electrons.' Cathode rays carry electronic currents through the tube. Researchers realized that something was traveling from the anode when objects placed in the tube in front of it could cast a shadow on the glowing wall.Electrons accelerated to high velocities travel in straight lines through an empty cathode ray tube and strike the glass wall of the tube, causing excited atoms to fluoresce or glow.

Anode cathode ray experiment