The TV dish antenna resembles shape of which mirror
Answers
Answer:
concave and convex mirrors work in the field of optics. The idea behind the curved, bowl-like shape of dish antennas is much the same: it facilitates the convergence of incident rays.
Explanation:
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Answer:
concave mirror
Explanation:
A communication satellite sends a parallel beam (collimated beam) of radio wave signals from outer space down into the atmosphere. Needless to say, these signals have to travel a very long distance to reach the dish antennas installed in your (and everyone else’s) house. When the parallel beam of signals strikes the curved surface, they converge at a single point in front of the dish, i.e., the focal point, and the incoming signal becomes much more consolidated, due to the combined energy of individual radio signals.
It’s interesting to note that the feedhorns of typical TV dish antennas are installed slightly below the middle of the dish, rather than precisely at the focal point of the dish. This is because dish antennas are usually offset antennas, i.e., a parabolic antenna whose feed (feedhorn of the antenna) is not set at the center of the curvature, but slightly off from it, hence the name ‘offset’ antenna.