Cassegrainian telescope

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Cassegrainian telescope

A coaxial optical system used to transmit and/or collect optical energy.

The concave primary mirror's surface is parabolic in shape and has a central hole into which light passes to or from a smaller, convex secondary mirror with a hyperbolic surface. The focus of the optical system is behind the hole in the primary mirror when collimated light illuminates the primary mirror.

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