Answer:
Than:
Baird's early mechanical television had 30 holes and rotated 12.5 times per second. There was a lens in front of the disk to focus light onto the subject. When light hit the subject, that light would be reflected into a photoelectric cell, which then converted this light energy to electrical impulses.
Now :
Television is an inescapable part of modern culture. We depend on TV for entertainment, news, education, culture, weather, sports—and even music, since the advent of music videos. ... News, current events and historical programming can help make young people more aware of other cultures and people.