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2. Mount Wilson Observatory - Wikipedia

   en.wikipedia.org/wiki/Mount_Wilson_Observatory

   The 60-inch (1.5 m) telescope at Mt. Wilson. For the 60-inch telescope, George Ellery Hale received the 60-inch (1.5 m) mirror blank, cast by Saint-Gobain in France, in 1896 as a gift from his father, William Hale. It was a glass disk 19 cm thick and weighing 860 kg.

3. One-way mirror - Wikipedia

   en.wikipedia.org/wiki/One-way_mirror

   One-way mirror. A one-way mirror, also called two-way mirror[1] (or one-way glass, half-silvered mirror, and semi-transparent mirror), is a reciprocal mirror that appears reflective from one side and transparent from the other. The perception of one-way transmission is achieved when one side of the mirror is brightly lit and the other side is dark.

4. 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 ...

5. Sextant - Wikipedia

   en.wikipedia.org/wiki/Sextant

   Sextant. A sextant is a doubly reflecting navigation instrument that measures the angular distance between two visible objects. The primary use of a sextant is to measure the angle between an astronomical object and the horizon for the purposes of celestial navigation. The estimation of this angle, the altitude, is known as sighting or shooting ...

6. We Asked Our Readers What Colors Will Be Appearing On Their ...

   www.aol.com/asked-readers-colors-appearing...

   Of course, for every earnest reply highlighting the treasured pieces that would be appearing on their tables, we had a host of other lighthearted responses that captured the celebratory nature of ...

7. Radius of curvature (optics) - Wikipedia

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

   Radius of curvature (optics) Radius of curvature (ROC) has specific meaning and sign convention in optical design. A spherical lens or mirror surface has a center of curvature located either along or decentered from the system local optical axis. The vertex of the lens surface is located on the local optical axis.