Discussion
The beam penetration method for displaying color pictures are used in .................... .
Answer: B
The beam penetration method is used in Random scan monitors.
A beam-penetration CRT coats the screen with two layers of phosphor, usually red and green. The speed of the electron beam decides how far it penetrates: slow electrons excite only the red layer, fast ones reach the green layer, and intermediate speeds give orange and yellow. It is an inexpensive way to get colour on random-scan (vector) displays, but offers only about four colours.
Raster-scan colour monitors use the shadow-mask method, with three phosphor dots and three electron guns. Direct view storage tubes and generic refresh CRTs are not the setting for beam penetration.
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