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2. Parabolic reflector - Wikipedia

   en.wikipedia.org/wiki/Parabolic_reflector

   A parabolic (or paraboloid or paraboloidal) reflector (or dish or mirror) is a reflective surface used to collect or project energy such as light, sound, or radio waves. Its shape is part of a circular paraboloid, that is, the surface generated by a parabola revolving around its axis. The parabolic reflector transforms an incoming plane wave ...

3. 40-foot telescope - Wikipedia

   en.wikipedia.org/wiki/40-foot_telescope

   William Herschel 's 40-foot telescope, also known as the Great Forty-Foot telescope, was a reflecting telescope constructed between 1785 and 1789 at Observatory House in Slough, England. It used a 48-inch (120 cm) diameter primary mirror with a 40-foot-long (12 m) focal length (hence its name "Forty-Foot"). It was the largest telescope in the ...

4. Door handle - Wikipedia

   en.wikipedia.org/wiki/Door_handle

   This is an accepted version of this page This is the latest accepted revision, reviewed on 24 October 2024. Device to open or close door Various examples of door handles throughout history A door handle or doorknob is a handle used to open or close a door. Door handles can be found on all types of doors including exterior doors of residential and commercial buildings, internal doors, cupboard ...

5. William Herschel - Wikipedia

   en.wikipedia.org/wiki/William_Herschel

   The concave mirror gathered more light than a lens, reflecting it onto a flat mirror at the end of the telescope for viewing. A smaller mirror could provide greater magnification and a larger field of view than a convex lens. Newton's first mirror was 1.3 inches in diameter; such mirrors were rarely more than 3 inches in diameter. [45]

6. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

7. f-number - Wikipedia

   en.wikipedia.org/wiki/F-number

   f-number. Diagram of decreasing apertures, that is, increasing f-numbers, in one-stop increments; each aperture has half the light-gathering area of the previous one. An f-number is a measure of the light-gathering ability of an optical system such as a camera lens. It is calculated by dividing the system's focal length by the diameter of the ...

8. The hiring rate trending lower could be a sign of problems to ...

   www.aol.com/finance/hiring-rate-trending-lower...

   The stock market climbed to all-time highs, with the S&P 500 setting a closing high of 5,762.48 on Monday. For the week, the S&P rose 0.2% to end at 5,751.07. The index is now up 20.6% year to ...

9. Nearly a dozen members of a single North Carolina family were ...

   www.aol.com/nearly-dozen-members-single-north...

   Friend Steve Runion, described the Craigs as a “larger than life” family who were “pillars of the community” he told CNN affiliate WRAL. “They would do anything for you,” he said.