What is meant by the "prime focus" of a telescope?

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    The ratio of the focal lengths of the primary mirror and the eyepiece used in a Newtonian reflector.
     The point at which the incoming light is focused to produce an image, where analysis instruments and imaging cameras can be placed.
     The first of several locations at which the primary mirror produces an image.
     The knob used to focus the image of a telescope.
     The ratio of the focal length of a telescope divided by its diameter.
asked Sep 20, 2012 in Astronomy by anonymous
    

1 Answer

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The point at which the incoming light is focused to produce an image, where analysis instruments and imaging cameras can be placed.
answered Sep 22, 2012 by SkyStar ~Expert~ (2,855 points)



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