Paragraph on “How does your Television set make a picture?” complete paragraph for Class 9, Class 10, Class 11 and Class 12

How does your Television set make a picture?

The television receiver does the opposite of what the camera did. On your TV screen is a chemical that glows when electrons hit it. An electron beam moves across the screen exactly in step with the beam in the camera. The current sent from the camera controls the strength of the beam. A strong beam gives a bright spot, a weak beam a dark spot, making up the picture. The beam moves very fast and covers the screen completely fifty times each second, so the picture on the screen seems to change smoothly. Modern TV sets also pick up signals giving the picture’s colour.