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2. The 14 Best Lighted Makeup Mirrors That Are Worth Every Penny

   www.aol.com/14-best-lighted-makeup-mirrors...

   Nearly 3,000 Amazon users have given this mirror a four- or five-star rating, making it one of the retailer’s best-selling lighted makeup mirrors. Perfect for those on a budget, this model ...

3. Optical coating - Wikipedia

   en.wikipedia.org/wiki/Optical_coating

   Optically coated mirrors and lenses. An optical coating is one or more thin layers of material deposited on an optical component such as a lens, prism or mirror, which alters the way in which the optic reflects and transmits light. These coatings have become a key technology in the field of optics.

4. 35 mm equivalent focal length - Wikipedia

   en.wikipedia.org/wiki/35_mm_equivalent_focal_length

   35 mm equivalent focal lengths are calculated by multiplying the actual focal length of the lens by the crop factor of the sensor. Typical crop factors are 1.26× – 1.29× for Canon (1.35× for Sigma "H") APS-H format, 1.5× for Nikon APS-C ("DX") format (also used by Sony, Pentax, Fuji, Samsung and others), 1.6× for Canon APS-C format, 2× for Micro Four Thirds format, 2.7× for 1-inch ...

5. Optical power - Wikipedia

   en.wikipedia.org/wiki/Optical_power

   Converging lenses have positive optical power, while diverging lenses have negative power. When a lens is immersed in a refractive medium, its optical power and focal length change. For two or more thin lenses close together, the optical power of the combined lenses is approximately equal to the sum of the optical powers of each lens: P = P 1 ...

6. Objective (optics) - Wikipedia

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

   These lenses are often color coded for easier use. The least powerful lens is called the scanning objective lens, and is typically a 4× objective. The second lens is referred to as the small objective lens and is typically a 10× lens. The most powerful lens out of the three is referred to as the large objective lens and is typically 40–100×.

7. Catadioptric system - Wikipedia

   en.wikipedia.org/wiki/Catadioptric_system

   The two surfaces of the reflector have different radii to correct the aberration of the spherical mirror. Light passes through the glass twice, making the overall system act like a triplet lens. [3] Mangin mirrors were used in searchlights, where they produced a nearly true parallel beam.