This give photo realistic pictures. Since there's a fixed amount of VRAM, an increase in color depth means a decrease in resolutino. Larger monitors need more VRAM for color depth and resolution. CRT Monitors refresh or update their images many times per second. Can cause eye strain, headaches, nausea.
Many monitors slow down their refresh rates if the resolution is increased.
Each gun shoots out a stream of electrons, one stream for each primaty color. The intensity of each stream is controlled by the signals from the video card. The video card also sends signals to a mechanism in the neck of the CRT that focuses and aims the electron beams. Part of the mechanism, a magnetic deflection yoke, uses electormagnetic fields to bend the path of the electron streams. The signals sent to teh yoke help determine the monitor's resolution and refresh rate.