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2. Fresnel lens - Wikipedia

   en.wikipedia.org/wiki/Fresnel_lens

   First-order rotating catadioptric Fresnel lens, dated 1870, displayed at the Musée national de la Marine, Paris.In this case the dioptric prisms (inside the bronze rings) and catadioptric prisms (outside) are arranged to concentrate the light from the central lamp into four revolving beams, seen by sailors as four flashes per revolution.

3. John Henry Holmes - Wikipedia

   en.wikipedia.org/wiki/John_Henry_Holmes

   Developing technology behind the modern light switch John Henry Holmes (1857 – 1935) was an English electrical engineer , inventor, Quaker and pioneer of electric lighting who invented the quick break light switch, the technology behind which remains the basis for modern wall mounted light switches .

4. Loupe - Wikipedia

   en.wikipedia.org/wiki/Loupe

   Loupe-mounted lights used to be fed by fiber optic cables that connected to either a wall-mounted or table-top light source. Newer models feature a more convenient LED lamp within the loupe-mounted light and an electric cord coming from either the conventional wall-mounted or table-top light source or a belt clip rechargeable battery pack.

5. Helping hand (tool) - Wikipedia

   en.wikipedia.org/wiki/Helping_hand_(tool)

   A commonly produced version consists of a weighted base, a pair of twice-adjustable arms ending in crocodile clips, and optionally a magnifying glass, held together by flexible joints. It is usual to work with an additional table lamp and there are also some third-hand models, with light already incorporated. [2]

6. Light switch - Wikipedia

   en.wikipedia.org/wiki/Light_switch

   The toggle light switch was invented in 1916 by William J. Newton. [2] As a component of an electrical wiring or home wiring system, the installation of light switches is regulated by some authority concerned with safety and standards. In different countries the standard dimensions of the wall mounting hardware (boxes, plates, etc.) may differ.

7. Sight magnifier - Wikipedia

   en.wikipedia.org/wiki/Sight_magnifier

   The pictured magnifier is flipped in, and is magnifying the view through the sight. [a] A sight magnifier is an optical telescope that can be paired with a non-magnifying optical sight on a weapon to create a telescopic sight. [1] [2] They work with the parallel collimated reticle image produced by red dot sights and holographic weapon sights.