Date: Mon, 8 Feb 1999 12:10:08 -0600 (CST)
Subject: Satellite dishes
Who is asking: Student
I have read your information on 'Why are satellite dishes parabolic", and I know the reciever should be placed at the focus of the parabola. Could you test this with lights beams and a parabolic mirror, or would light beams behave differently. Thanks.
Yes you can locate it by using the light beams. They behave the same way. Good idea! This is exactly how a reflecting telescope works. The light from a distant object is reflected off a parabolic mirror and concentrated at the focus. The mirror behind the headlight of a car is also parabolic, but here the light source is at the focus and the light is reflected off the mirror in parallel rays.
Jack and Harley
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