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A three-mirror anastigmat is an anastigmat telescope built with three curved mirrors, enabling it to minimize all three main optical aberrations – spherical aberration, coma, and astigmatism. This is primarily used to enable wide fields of view, much larger than possible with telescopes with just one or two curved surfaces.
Spectrophobia (derived from Latin: spectrum, n. specio, an appearance, form, image of a thing; an apparition, spectre) or catoptrophobia (from Greek κάτοπτρον kátoptron, "mirror") is a kind of specific phobia involving an abnormal and persistent fear of mirrors, and an anxiety about seeing one's own face reflected in them. [1]
Spherical mirrors, however, suffer from spherical aberration—parallel rays reflected from such mirrors do not focus to a single point. For parallel rays, such as those coming from a very distant object, a parabolic reflector can do a better job. Such a mirror can focus incoming parallel rays to a much smaller spot than a spherical mirror can.
BDD is a disorder in the obsessive–compulsive spectrum, [9] but involves more depression and social avoidance despite a degree of overlap with obsessive–compulsive disorder (OCD). [10] [1] BDD often associates with social anxiety disorder (SAD). [10] Some experience delusions that others are covertly pointing out their flaws. [2]
He struggles with mental issues such as anxiety and depression, and has admitted to being addicted to drugs. His 1994 hit song, “Basket Case” was written about his issues with anxiety disorder and depression. Fiona Apple (born 1977), American singer-songwriter ("Criminal", "Paper Bag", "Fast as You Can"). She struggles with obsessive ...
A convex secondary mirror is placed just to the side of the light entering the telescope, and positioned afocally so as to send parallel light on to the tertiary. The concave tertiary mirror is positioned exactly twice as far to the side of the entering beam as was the convex secondary, and its own radius of curvature distant from the secondary.