1. The image of something as reflected by a mirror (or other reflective material).
2. A fixing of thoughts on something; careful consideration.
3. A thought occurring in consideration or meditation.
4. An unfavorable remark or observation.
5. The return of light, heat, sound, etc., after striking a surface.
6. In anatomy, the bending or folding back of a part upon itself.

A reflection process in which the reflected radiation is sent out in many directions, usually bearing no simple relationship to the angle of incidence; characteristic of rough surfaces.

The strong return of light that occurs when its rays strike suspensoids; such as, dust particles, whose diameters exceed the light's wavelength.

In crystallography, a construction for considering conditions for diffraction in terms of the reciprocal rather than the real lattice.

It is a sphere with the incident beam along a diameter. The origin of the reciprocal lattice is positioned at the point where the incident beam emerges from the sphere.

Whenever a reciprocal lattice point touches the surface of the sphere, the conditions for a diffracted (or reflected) beam are satisfied.

The trapping of light by refraction and reflection at critical angles inside a semiconductor device, so that it cannot escape the device and must eventually be absorbed by the semiconductor.

1. The ratio of the complex electric field strength or voltage of a reflected wave to that of the incident wave.
2. The ratio of the phasor representing the magnitude and phase of the electric field of the backward-traveling wave at a specified cross section of a waveguide to the phasor representing the forward-traveling wave at the same cross section.