Why
are
only selective programmes shown on the television
Answers
Answer:
This because THE most awe-inspiring weapon of communications ever invented.” How well those words, spoken by a noted author of television documentaries, describe the wonder of television! And wonder it is!
Just as your eye travels back and forth some forty-six times to read a column of type in this magazine so the TV camera beam used in the United States scans each picture or image in 525 lines. With thirty complete pictures per second, this means the beam takes less than a fifteen-thousandth of a second to scan a line. Talk about speed reading! Not only that, but the camera first scans all the odd lines, 1, 3, 5, 7 and so on, and then goes back to the top left corner of the picture and scans all the even lines, 2, 4, 6. The process by which TV cameras photograph color and the TV sets reproduce it (although no color is actually broadcast) is even more cause for wonder.
Explanation: