Angle in a mirror segment is
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The telescope's main mirror is fixed at a 55 degree angle and can rotate around its base. A target is tracked by moving the instruments at the focus of the telescope; this allows access to about 70–81% of the sky at its location and a single target can be tracked for up to two hours.
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The mirror is now represented by a straight line segment, and so are the incoming and reflected rays of light. Let's write P for the point at which the ray meets the mirror. See the image below. The angle α is called the angle of incidence and the angle β is called the angle of reflection.
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