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	Term	术语	Definition	定义
	reference tape	基准基线尺	A BASE TAPE employed solely for use as a STANDARD of comparison. Also called standard tape.	一种专门作为比较标准的基线尺，亦称standard tape（标准基线尺）。
	reflectance	反射比，反射系数	The ratio of light given off by an object to the amount of light striking the object, expressed as percentage.	某一物体发出的光与到达这个物体的光量之比，用百分数表示。
	reflected wave	反射波	See WAVE.	由于反射而改变方向的波。
	reflecting projector	反射投影器	See PROJECTOR.	摄影测量中，可将航摄像片的影像投影到地图上的仪器。通过变换投影器透镜的位置，可以改变所投影影�... more 摄影测量中，可将航摄像片的影像投影到地图上的仪器。通过变换投影器透镜的位置，可以改变所投影影像的比例，通过倾斜台面可校正像片的斜度。
	reflecting telescope	反射望远镜	See TELESCOPE.	使用凹镜聚集光束的望远镜。
	reflection	反射	The process whereby a surface of discontinuity turns back a portion of the incident RADIATION into the medium through which the RADIATION ... 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.	由不连续表面将一部分入射能量返回到原来所通过的介质的过程。参见surface reflection(表面反射)。
	reflection: angle of	NULL	See ANGLE OF REFLECTION.	NULL
	reflectivity	反射率，反射系数	The ratio of the RADIANT ENERGY reflected by a surface to that incident upon it.	投射于物体表面的辐射能被反射的比率。
	reflector	反射器，反射镜	A device capable of or intended for reflecting particles or RADIANT ENERGY. See RADAR REFLECTOR.	能够用于或专门设计用于反射粒子与辐射能的装置。参见radar reflector（雷达反射器）。
	refracted wave	折射波	See WAVE.	由于折射而改变方向的波。
	refracting telescope	折射望远镜	See TELESCOPE.	通过使用单个透镜或多组透镜聚集光束的望远镜。
	refraction	折射	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.	能量传播方向改变的过程，这是由于传播介质内部密度的变化，或者能量通过了密度不同的两介质的界面�... more 能量传播方向改变的过程，这是由于传播介质内部密度的变化，或者能量通过了密度不同的两介质的界面。
	refraction: angle	NULL	See ANGLE OF REFRACTION.	NULL
	refraction: astronomical	NULL	The apparent displacement of an object that results from LIGHT RAYS from a source outside the ATMOSPHERE being bent in passing the ATMOSPH... 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.	NULL
	refraction: atmospheric	大气折射	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.	辐射能射线斜穿过大气层时发生的折射，如果射线由外太空进入大气层，则称为大气折射。如果射线由地�... more 辐射能射线斜穿过大气层时发生的折射，如果射线由外太空进入大气层，则称为大气折射。如果射线由地球表面或附近的某点发出的，则称为地面折射。
	refraction: coastal	海岸折射	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 refl... 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.	无线电波斜向经过海岸线时，由于陆地和水域传导和反射性质的不同，而导致的电磁波方向微小的改变。
	refraction: coefficient of	NULL	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 t... 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.	NULL
	refraction: index of	NULL	The ratio of the sine of the ANGLE OF INCIDENCE to the sine of the ANGLE OF REFRACTION.	NULL
	refraction correction	折射改正	A CORRECTION due to REFRACTION, particularly such a CORRECTION to a SEXTANT ALTITUDE, due to ATMOSPHERIC REFRACTION.	由于折射而进行的改正，特别是由于大气折射引起的六分仪高度改正。
	refraction of light	光折射	The bending of LIGHT RAYS in passing from one transparent medium into another which has a different INDEX OF REFRACTION.	光线从一种透明介质到另一种折射率不同的介质所发生的转向。
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