Newtonian Telescope
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This Demonstration allows you to calculate the optimal characteristics for a Newtonian telescope, including mirror and lens parameters, and aperture width. The equation of a parabolic mirror is 
, where 
is the focal parameter. The focal distance is defined as 
.
Contributed by: Ihor Holovatskyy (April 2011)
(Lyceum #1, Chernivtsi, Ukraine)
Open content licensed under CC BY-NC-SA
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"Newtonian Telescope"
http://demonstrations.wolfram.com/NewtonianTelescope/
Wolfram Demonstrations Project
Published: April 11 2011
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