Where is the Focus?
![Parabolic mirror](https://public.nrao.edu/wp-content/uploads/2013/09/gallery-images-largeGBSCplaywarp1_large.jpg)
All of our radio telescopes’ dishes are shaped into parabolas, because a parabola reflects waves to a precise focus. In the Green Bank Science Center, visitors can experiment with a parabolic mirror to try to find its exact focus.
Credit: NRAO/AUI/NSF
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