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In a reflecting telescope, a secondary mirror is used to:
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move the eyepiece outside the telescopic tube
(d) To redirect the light that enters the telescope to the eyepiece or camera. The primary mirror of a reflecting telescopes gathers the light and reflects towards the secondary mirror which then reflect the light towards the eyepiece allowing the observer to see image.
It has advantage of a large focal length in a short telescope.
It has advantage of a large focal length in a short telescope.
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