Paragraph on “When was Television invented?” complete paragraph for Class 9, Class 10, Class 11 and Class 12
When was Television invented?
John L. Baird of Scotland made the first simple television soon after the first world war. Public TV started in 1936 in Britain.
How does a television camera work ?
A TV camera has to convert a whole picture into an electric current. First of all a picture, called an ‘image’, of the scene in front of the camera is focused onto a screen inside. A thin beam of tiny particles of electricity, called `electrons’, is fired at the screen, moving over it bit by bit. It works in lines across the image, one line under the other, in the same order as you read the words on a page. When it has scanned the whole screen it starts again. The beam gives an electric current which is strong for bright parts and weak for dark parts. This current goes out along a cable or is transmit-ted as radio waves.
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