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2. Vergence (optics) - Wikipedia

   en.wikipedia.org/wiki/Vergence_(optics)

   For optics like convex lenses, the converging point of the light exiting the lens is on the input side of the focal plane, and is positive in optical power. For concave lenses, the focal point is on the back side of the lens, or the output side of the focal plane, and is negative in power.

3. Wikipedia : Picture peer review/Concave and Convex mirrors

   en.wikipedia.org/.../Concave_and_Convex_mirrors

   A concave mirror A convex mirror A convex mirror - SVG version. Reasons of nomination: According to the standards page, the images are: Of High Quality; Have a free license; Add value to an article; Accurate; With good captions; According to the same standards, the images might be: Wikipedia's best work; pleasing to the eye

4. 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.

5. Convex and Concave - Wikipedia

   en.wikipedia.org/wiki/Convex_and_Concave

   Convex and Concave is a lithograph print by the Dutch artist M. C. Escher, first printed in March 1955. [1] It depicts an ornate architectural structure with many ...

6. Molding (decorative) - Wikipedia

   en.wikipedia.org/wiki/Molding_(decorative)

   Other varieties of concave moulding are the scotia and congé and other convex mouldings the echinus, the torus and the astragal. Placing an ovolo directly above a cavetto forms a smooth s-shaped curve with vertical ends that is called an ogee or cyma reversa moulding. Its shadow appears as a band light at the top and bottom but dark in the ...

7. 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.