How do you get a multi-colored image on a color TV screen?

In the kinescope of a color TV, there are three electronic “guns” at once, firing three beams at the screen. Thousands of dots of red, green and blue phosphors that cover the screen glow when electrons hit them. A metal mask with many holes is placed inside the CRT in front of the screen. These holes are located so that the electron beam, which forms the red part of the image, can only hit the phosphor, which causes the red glow; the ray that “paints” the green part of the image is directed to the points of the green phosphor; finally, the third ray hits only the blue phosphor grains. Since the grains of colored phosphors are very small and close to each other, our eye perceives them as a whole color image.

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