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2. Twin-lens reflex camera - Wikipedia

   en.wikipedia.org/wiki/Twin-lens_reflex_camera

   In addition to the objective, the viewfinder consists of a 45-degree mirror (the reason for the word reflex in the name), a matte focusing screen at the top of the camera, and a pop-up hood surrounding it. The two objectives are connected, so that the focus shown on the focusing screen will be exactly the same as on the film.

3. Binoculars - Wikipedia

   en.wikipedia.org/wiki/Binoculars

   Without a mirror coating most of that light would be lost. Roof prism aluminum mirror coating (reflectivity of 87% to 93%) or silver mirror coating (reflectivity of 95% to 98%) is used. [65] [66] In older designs silver mirror coatings were used but these coatings oxidized and lost reflectivity over time in unsealed binoculars.

4. 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.

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   Simplehuman 8” LED Light Sensor Mirror with 5x and 10x Magnification. $150 at Costco. ... These ankle boots are only $10 at Walmart today; AOL. The best walker for seniors of 2025, according to ...

6. Boots Opticians - Wikipedia

   en.wikipedia.org/wiki/Boots_Opticians

   All of Boots Opticians' laser eye surgeries were bought by Optical Express in late 2004. [ citation needed ] On 29 January 2009, it was announced that Boots Opticians were to merge with Dollond & Aitchison , forming a chain of 690 stores and 5,000 staff after Boots purchased a controlling share in D&A. [ 5 ] [ 6 ] In May 2019, the company was ...

7. Telescopic sight - Wikipedia

   en.wikipedia.org/wiki/Telescopic_sight

   Exit pupil – Telescopic sights concentrate the light gathered by the objective into a beam, the exit pupil, whose diameter is the objective diameter divided by the magnifying power. For maximum effective light-gathering and brightest image, the exit pupil should equal the diameter of the fully dilated iris – for a youthful dark-adapted ...