With the television set turned off, take a close look at the screen of a color-television set. If you have a magnifying glass available, it will help to get a good view of the detail.
a. Describe the pattern of lines that you observe. Produce a careful sketch showing the arrangement of the lines. How many lines are there, approximately?
b. If there is a black-and-white television set handy, compare the pattern on its screen to the color set. What differences can you describe?