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| Description: (a) Different parts of a spherically concave mirror reflect light to slightly different focal points. This effect, spherical aberration, causes image blurring. This problem can be overcome by (b) using a parabolic mirror or (c) using a Schmidt corrector plate (a specially curved lens) in front of the telescope. Picture Stats: Views: 550 Filesize: 126.02kB Height: 900 Width: 709 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=15894 |