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2. Reflecting telescope - Wikipedia

   en.wikipedia.org/wiki/Reflecting_telescope

   24-inch convertible Newtonian/Cassegrain reflecting telescope on display at the Franklin Institute. A reflecting telescope (also called a reflector) is a telescope that uses a single or a combination of curved mirrors that reflect light and form an image. The reflecting telescope was invented in the 17th century by Isaac Newton as an ...

3. Speed of light - Wikipedia

   en.wikipedia.org/wiki/Speed_of_Light

   A method of measuring the speed of light is to measure the time needed for light to travel to a mirror at a known distance and back. This is the working principle behind experiments by Hippolyte Fizeau and Léon Foucault. The setup as used by Fizeau consists of a beam of light directed at a mirror 8 kilometres (5 mi) away. On the way from the ...

4. Foucault's measurements of the speed of light - Wikipedia

   en.wikipedia.org/wiki/Foucault's_measurements_of...

   He used carefully calibrated tuning forks to monitor the rotation rate of the air-turbine-powered mirror R, and he would typically measure displacements of the slit image on the order of 115 mm. [7] His 1879 figure for the speed of light, 299944±51 km/s, was within about 0.05% of the modern value.

5. Observable universe - Wikipedia

   en.wikipedia.org/wiki/Observable_universe

   The comoving distance from Earth to the edge of the observable universe is about 14.26 gigaparsecs (46.5 billion light-years or 4.40 × 10 26 m) in any direction. The observable universe is thus a sphere with a diameter of about 28.5 gigaparsecs [ 32 ] (93 billion light-years or 8.8 × 10 26 m). [ 33 ]

6. Dielectric mirror - Wikipedia

   en.wikipedia.org/wiki/Dielectric_mirror

   Dielectric mirror. A dielectric mirror, also known as a Bragg mirror, is a type of mirror composed of multiple thin layers of dielectric material, typically deposited on a substrate of glass or some other optical material. By careful choice of the type and thickness of the dielectric layers, one can design an optical coating with specified ...

7. Prepare for the big game with this best-selling folding table ...

   www.aol.com/lifestyle/walmart-folding-table-deal...

   Mainstays 4 Foot Fold-in-Half Adjustable Folding Table. $38 $40 Save $2. Useful for game day and beyond, this adjustable folding table can be pulled out whenever you need a little bit of extra ...