Why does the objective of an optical telescope have large focal length and large
aperture? Also explain why does a reflector give better image of a small portion of the
celestial body?
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The big lens in the telescope (objective lens) collects much more light than your eye can from a distant object and focuses the light to a point (the focal point) inside the telescope. A smaller lens (eyepiece lens) takes the bright light from the focal point and magnifies it so that it uses more of your retina
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