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2. Curved mirror - Wikipedia

   en.wikipedia.org/wiki/Curved_mirror

   A concave mirror, or converging mirror, has a reflecting surface that is recessed inward (away from the incident light). Concave mirrors reflect light inward to one focal point. They are used to focus light. Unlike convex mirrors, concave mirrors show different image types depending on the distance between the object and the mirror.

3. Lieberkühn reflector - Wikipedia

   en.wikipedia.org/wiki/Lieberkühn_reflector

   The Lieberkühn reflector completely surrounds the objective lens, featuring a central hole through which it is mounted onto the lens. The mirrored inner surface faces the specimen. A Lieberkühn reflector is typically a concave mirror [6] (see illustrations), one descriptions uses a flat mirror at a 45-degree angle. [7]

4. Focal length - Wikipedia

   en.wikipedia.org/wiki/Focal_length

   The focal point F and focal length f of a positive (convex) lens, a negative (concave) lens, a concave mirror, and a convex mirror. The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power.

5. Hockney–Falco thesis - Wikipedia

   en.wikipedia.org/wiki/Hockney–Falco_thesis

   In July 2000, Falco and Hockney published "Optical Insights into Renaissance Art" in Optics & Photonics News, vol. 11, a detailed analysis of the likely use of concave mirrors in certain Renaissance paintings, particularly the Lotto painting. Experiments with a concave mirror (which technically is also a lens) of the calculated properties ...

6. Center of curvature - Wikipedia

   en.wikipedia.org/wiki/Center_of_curvature

   A concave mirror with light rays Center of curvature. In geometry, the center of curvature of a curve is a point located at a distance from the curve equal to the radius of curvature lying on the curve normal vector. It is the point at infinity if the curvature is zero. The osculating circle to the curve is centered at the centre of curvature.

7. Reflecting telescope - Wikipedia

   en.wikipedia.org/wiki/Reflecting_telescope

   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.