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Better to say Reflector dishes instead of reflecting disks.
The TV dish receiver is not necessarily parabolic, since the focus is below the center of the dish as we can clearly see in the photo.
Not clear what this means. All these dishes have essentially a parabolic meridian, truncated at various depths. Dish designs have focal length f / Dish diameter d ratio ( known as f/d in the industry ) between say 0.5 for shallow dishes to .25 for deep dishes terminated at latus rectum, normal value is around 0.3.
Regards
Narasimham
Xah Lee <xah@...> wrote:
Xah Lee <xah@...> wrote:
just created this page:
http://xahlee.org/Whirlwheel_dir/reflecting_disks/reflecting_disks.html
a photo gallery of reflecting disks. (radio dishes, solar dishes)
Xah
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