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2. A magnifying mirror is a travel must-have for anyone over the ...

   www.aol.com/lifestyle/a-magnifying-mirror-is-a...

   The Kintion Pocket Mirror provides a portable, two-sided compact (with each mirror side measuring a generous 3.3 by 2.5 inches) that is ideal for slipping into your purse or weekender. One side ...

3. Optical telescope - Wikipedia

   en.wikipedia.org/wiki/Optical_telescope

   The Large Binocular Telescope at the Mount Graham International Observatory in Arizona uses two curved mirrors to gather light. An optical telescope is a telescope that gathers and focuses light mainly from the visible part of the electromagnetic spectrum, to create a magnified image for direct visual inspection, to make a photograph, or to collect data through electronic image sensors.

4. Objective (optics) - Wikipedia

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

   In a telescope the objective is the lens at the front end of a refracting telescope (such as binoculars or telescopic sights) or the image-forming primary mirror of a reflecting or catadioptric telescope. A telescope's light-gathering power and angular resolution are both directly related to the diameter (or "aperture") of its objective lens or ...

5. Optical power - Wikipedia

   en.wikipedia.org/wiki/Optical_power

   In optics, optical power (also referred to as dioptric power, refractive power, focusing power, or convergence power) is the degree to which a lens, mirror, or other optical system converges or diverges light. It is equal to the reciprocal of the focal length of the device: P = 1/f. [1] High optical power corresponds to short focal length.

6. Eyepiece - Wikipedia

   en.wikipedia.org/wiki/Eyepiece

   The generally accepted visual distance of closest focus is 250 mm, and eyepiece power is normally specified assuming this value. Common eyepiece powers are 8×, 10×, 15×, and 20×. The focal length of the eyepiece (in mm) can thus be determined if required by dividing 250 mm by the eyepiece power.

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

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   10. Fancii Magnifying Mirror. Most Highly Reviewed Lighted Makeup Mirror. This small Fancii mirror has over 12,500 positive reviews. While conveniently compact at just six inches wide, it doesn ...