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A Wolter telescope is a type of reflector telescope configured so the reflections are shallow, i.e., far from perpendicular to the reflective surface, with a small angle between the surface and the beam, a general design termed grazing incidence optics. The design is intended for X-rays, which are more likely to penetrate the reflective surface if they strike it any closer to perpendicular, and is a common design for X-ray telescopes. There are a number of subtypes that differ substantially. Example Wolter telescopes: