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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Larger aperture because that creates a larger light collecting area and provides better resolution of small details. ... Because the light rays are parallel to each other, the reflector telescope's mirror has a parabolic shape. The parabolic-shaped mirror focusses the parallel lights rays to a single point.
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