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For example, for visible light, the refractive index of glass is typically around 1.5, meaning that light in glass travels at c / 1.5 ≈ 200 000 km/s (124 000 mi/s); the refractive index of air for visible light is about 1.0003, so the speed of light in air is about 90 km/s (56 mi/s) slower than c.
At the top right corner is a monocular for assisting the alignment of the two heads. Free-space optical communication ( FSO) is an optical communication technology that uses light propagating in free space to wirelessly transmit data for telecommunications or computer networking. "Free space" means air, outer space, vacuum, or something similar.
By recording the attenuation of light for various wavelengths, an absorption spectrum can be obtained. In physics, absorption of electromagnetic radiation is how matter (typically electrons bound in atoms) takes up a photon 's energy — and so transforms electromagnetic energy into internal energy of the absorber (for example, thermal energy ).
Video magnifier. Video magnifiers are electronic devices that use a camera and a display screen to perform digital magnification of printed materials. The display screen is usually LCD or a similar flat-screen technology (although older video magnifiers have used CRT displays), and the device usually includes a lamp to illuminate the source ...
Light combat aircraft. A light combat aircraft ( LCA) is a light, multirole jet/turboprop military aircraft, commonly derived from advanced trainer designs, designed for engaging in light combat. [citation needed] The mission can either be in a light strike or attack missions, reconnaissance, interdiction roles or trainer roles.
Radiation pressure. Force on a reflector results from reflecting the photon flux. Radiation pressure (also known as light pressure) is mechanical pressure exerted upon a surface due to the exchange of momentum between the object and the electromagnetic field. This includes the momentum of light or electromagnetic radiation of any wavelength ...
The Devon One Piece. The dainty sunflower print on this feminine one-piece feels summery without getting cliché. In case you want a little support up top, there’s also a removable strap ...
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