Why does the objective of an optical telescope have large focal length and large aperture?
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The objective of a telescope have large focal length and large aperture because large focal length enhances the magnifying power of the telescope and large aperture help in collecting large amount of light coming from the object so that a bright image is obtained.
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Because the large focal length enhance the magnifying power of telescope and large aperture collect more and more light that come from the object so that the bright image obtained
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