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Total record count: 6269.

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Eng ID Term Definition
4321
reference tape
A BASE TAPE employed solely for use as a STANDARD of comparison. Also called standard tape.
4322
reflectance
The ratio of light given off by an object to the amount of light striking the object, expressed as percentage.
4323
reflected wave
See WAVE.
4324
reflecting projector
See PROJECTOR.
4325
reflecting telescope
See TELESCOPE.
4326
reflection
The process whereby a surface of discon­tinuity turns back a portion of the incident RADIATION into the medium through which the RADIATION a... more
The process whereby a surface of discon­tinuity turns back a portion of the incident RADIATION into the medium through which the RADIATION ap­proached. See SURFACE REFLECTION.
4327
reflection: angle of
See ANGLE OF REFLECTION.
4328
reflectivity
The ratio of the RADIANT ENERGY reflec­ted by a surface to that incident upon it.
4329
reflector
A device capable of or intended for reflec­ting particles or RADIANT ENERGY. See RADAR REFLECTOR.
4330
refracted wave
See WAVE.
4331
refracting telescope
See TELESCOPE.
4332
refraction
The process in which the direction of energy propagation is changed as the result of a change in density within the propagating medium, or a... more
The process in which the direction of energy propagation is changed as the result of a change in density within the propagating medium, or as the energy passes through the INTERFACE representing a density discontinuity between two media.
4333
refraction: angle
See ANGLE OF REFRACTION.
4334
refraction: astronomical
The apparent displacement of an object that results from LIGHT RAYS from a source outside the ATMOSPHERE being bent in passing the ATMO­SPHE... more
The apparent displacement of an object that results from LIGHT RAYS from a source outside the ATMOSPHERE being bent in passing the ATMO­SPHERE. This results in all objects appearing to be higher above the HORIZON than they actually are.
4335
refraction: atmospheric
Refraction resulting when a ray of radiant energy passes obliquely through the atmosphere. It may be called astronomical refraction if the r... more
Refraction resulting when a ray of radiant energy passes obliquely through the atmosphere. It may be called astronomical refraction if the ray enters the atmosphere from outer space, or terrestrial refraction if it emanates from a point on or near the surface of the EARTH.
4336
refraction: coastal
A small change in the direction of travel of a RADIO WAVE when it crosses a SHORELINE obliquely due to a difference in conducting and re­fle... more
A small change in the direction of travel of a RADIO WAVE when it crosses a SHORELINE obliquely due to a difference in conducting and re­flecting properties between land and water, and thus velocity.
4337
refraction: coefficient of
The ratio of the ANGLE OF REFRACTION at the point of observation to the angle at the centre of the EARTH subtended by the arc connect­ing th... more
The ratio of the ANGLE OF REFRACTION at the point of observation to the angle at the centre of the EARTH subtended by the arc connect­ing the point of observation and the observed point.
4338
refraction: index of
The ratio of the sine of the ANGLE OF INCIDENCE to the sine of the ANGLE OF REFRACTION.
4339
refraction correction
A CORRECTION due to REFRACTION, particularly such a CORRECTION to a SEXTANT ALTITUDE,­ due to ATMOSPHERIC REFRACTION.
4340
refraction of light
The bending of LIGHT RAYS in passing from one transparent medium into another which has a different INDEX OF REFRAC­TION.