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Pfund's instrument, allowed the angle of measurement to be varied, but maintained the angle of view to the angle of illumination. Reflected light was measured using a pyrometer lamp as a photometer. The 'glossimeter' was the first to use black glass standards as a basis for reflectance setting.
Blacklight fluorescent tubes. The violet glow of a blacklight is not the UV light itself, but visible light that escapes being filtered out by the filter material in the glass envelope. A blacklight, also called a UV-A light, Wood's lamp, or ultraviolet light, is a lamp that emits long-wave ultraviolet light and very little visible light.
Transparency refers to the optical distinctness with which an object can be seen when viewed through plastic film/sheet, glass, etc. In the manufacture of sheeting/film, or glass the quantitative assessment of transparency is just as important as that of haze. [1] Transparency depends on the linearity of the passage of light rays through the ...
The glass envelopes illustrate the dark blue color of Wood's glass, although these modern tubes actually use another optical filtering material. Wood's glass is an optical filter glass invented in 1903 by American physicist Robert Williams Wood (1868–1955), which allows ultraviolet and infrared light to pass through, while blocking most ...
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Light scattering in liquids and solids depends on the wavelength of the light being scattered. Limits to spatial scales of visibility (using white light) therefore arise, depending on the frequency of the light wave and the physical dimension (or spatial scale) of the scattering center. Visible light has a wavelength scale on the order of 0.5 μm.
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A λ/20 optical flat that has been coated with aluminum, making a first-surface mirror Two optical flats tested using 589 nm laser-light. At 2 inches (5.1 cm) in diameter and 0.5 inches (13 mm) thick, both surfaces are flat to within 1/10 of the wavelength of the light (58.9 nm), as indicated by the perfectly straight fringes.