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2. Emergency vehicle lighting - Wikipedia

   en.wikipedia.org/wiki/Emergency_vehicle_lighting

   Red and blue emergency lights on a fire engine in Canberra, Australia. Emergency vehicle lighting, also known as simply emergency lighting or emergency lights, is a type of vehicle lighting used to visually announce a vehicle's presence to other road users. A sub-type of emergency vehicle equipment, emergency vehicle lighting is generally used ...

3. Optical landing system - Wikipedia

   en.wikipedia.org/wiki/Optical_landing_system

   The concave mirror, source light combination was replaced with a series of fresnel lenses. The Mk 6 Mod 3 FLOLS was tested in 1970 and had not changed much, except for when ship's heave was taken into account with an inertial stabilisation system. These systems are still in wide use on runways at US Naval Air Stations. [4]

4. Barcode reader - Wikipedia

   en.wikipedia.org/wiki/Barcode_reader

   On the other hand, if a too small dot of light is used, then it can misinterpret any spot on the bar code making the final output wrong. The most commonly used dimension is 13 mil (0.013 in or 0.33 mm), although some scanners can read codes with dimensions as small as 3 mil (0.003 in or 0.075 mm). Smaller bar codes must be printed at high ...

5. Parabolic aluminized reflector - Wikipedia

   en.wikipedia.org/wiki/Parabolic_aluminized_reflector

   A parabolic aluminized reflector lamp (PAR lamp or simply PAR) is a type of electric lamp that is widely used in commercial, residential, and transportation illumination. It produces a highly directional beam. Usage includes theatrical lighting, locomotive headlamps, aircraft landing lights, and residential and commercial recessed lights ("cans ...

6. Jupiter (lenses) - Wikipedia

   en.wikipedia.org/wiki/Jupiter_(lenses)

   Jupiter-21 200 mm f/4.0 lens. Jupiter-21 is a telephoto lens with focal length of 200mm. Its maximum aperture is f/4.0. The lens was made in multiple mounts and is frequently adapted to modern cameras nowadays. There are multiple versions of the lens. The most common one is the Jupiter-21M, which has M42 mount.

7. Condenser (optics) - Wikipedia

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

   A condenser is an optical lens that renders a divergent light beam from a point light source into a parallel or converging beam to illuminate an object to be imaged. Condensers are an essential part of any imaging device, such as microscopes, enlargers, slide projectors, and telescopes. The concept is applicable to all kinds of radiation ...