incident ray

in·ci·dent ray

the ray that strikes the surface before reflection.
References in periodicals archive ?
The "plane of incidence" is that containing the unit normal vector from the surface of incidence and the direction of the incident ray.
The angle between reflected and refracted rays resulting from a given incident ray is then 90[degrees].
MODERNISED: Percy Shaw from The road studs use a built in solar powered LED that is automatically illuminated from dusk till dawn and is visible from up to 10 times further than a traditional cat's eye that contain 'retroreflectors' - optical devices that reflect light rays back along a path parallel to that of the incident ray.
Asked about that notorious incident Ray said: "The only thing I was worried about was the reaction I was going to get back in Dublin for wearing the England jersey.
The first argument denotes the type of incident ray while the second one the reflected ray.
Another alternative to increase light performance at low sun altitude angles is to use prismatic elements placed on the external northern surface of the collector to highly reflect (using the total internal reflection feature of prisms) the portion of the incident rays that reach the internal surface of the collector before getting into the pipe space.
Stiles measured these colour changes by noting the change in wavelength required of oblique rays in order to produce the same hue as perceived with centrally incident rays of light.
The energy of incident rays was absorbed by the containers and the thermometers indicated temperatures higher than the ambient temperature.
AX]([beta],[epsilon]) arising from incident rays all with the same axial divergence [beta].
ib] are equal while the incident rays are unidirectional.
Rays of light entering the eye near the pupil edge are focussed in front of the retina (positive spherical aberration), whereas centrally incident rays of light are focussed further behind (negative spherical aberration).
The broadening due to the thickness of the crystal will affect all incident rays impinging upon the surface along the focal circle and the [DELTA]L broadening effect will occur either for Johann or Johansson curved crystals.

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