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2. Foucault knife-edge test - Wikipedia

   en.wikipedia.org/wiki/Foucault_knife-edge_test

   It measures mirror surface dimensions by reflecting light into a knife edge at or near the mirror's centre of curvature. In doing so, it only needs a tester which in its most basic 19th century form consists of a light bulb , a piece of tinfoil with a pinhole in it, and a razor blade to create the knife edge.

3. Birefringence - Wikipedia

   en.wikipedia.org/wiki/Birefringence

   In healthy subjects, the maximum retardation induced by the Henle fiber layer is approximately 22 degrees at 840 nm. [23] Furthermore, scanning laser polarimetry uses the birefringence of the optic nerve fiber layer to indirectly quantify its thickness, which is of use in the assessment and monitoring of glaucoma .

4. Standing Figure: Knife Edge - Wikipedia

   en.wikipedia.org/wiki/Standing_Figure:_Knife_Edge

   Moore enlarged the work again to create the 3.6 metres (11 ft 10 in) high Large Standing Figure: Knife Edge (LH 482a), cast in 1976 in an edition of 8 (6 plus 2 artist's copies). The two artists copies, cast 0 and cast 00, are owned by the Henry Moore Foundation, with one displayed in Greenwich Park from 1979 to 2007, and again since 2011.

5. Conservation and restoration of wooden furniture - Wikipedia

   en.wikipedia.org/wiki/Conservation_and...

   Furniture conservation and restoration can be divided into two general areas: structure and finish. Structure generally relates to wood and can be divided into solid, joined, and veneered wood. The finish of furniture can be painted or transparent. [1] Furniture has existed throughout all the years of human existence.

6. Mirror - Wikipedia

   en.wikipedia.org/wiki/Mirror

   A mirror reflecting the image of a vase A first-surface mirror coated with aluminium and enhanced with dielectric coatings. The angle of the incident light (represented by both the light in the mirror and the shadow behind it) exactly matches the angle of reflection (the reflected light shining on the table). 4.5-metre (15 ft)-tall acoustic mirror near Kilnsea Grange, East Yorkshire, UK, from ...

7. Picture frame - Wikipedia

   en.wikipedia.org/wiki/Picture_frame

   View of a frame-maker's workshop, oil on canvas, circa 1900 The elaborate decoration on this frame may be made by adhering molded plaster pieces to the wood base.. A picture frame is a container that borders the perimeter of a picture, and is used for the protection, display, and visual appreciation of objects and imagery such as photographs, canvas paintings, drawings and prints, posters ...