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# Chapter 29 Vocab

Reflection The bouncing back of a particle or wave that strikes the boundary between two media.
Normal A line perpendicular to a surface.
Angle of Incidence Angle between an incident ray and the normal to a surface.
Angle of Reflection Angle between a reflected ray and the normal to a surface.
Law of Reflection The angle of incidence for a wave that strikes a surface is equal to the angle of reflection. This is true for both partially and totally reflected waves.
Virtual Image An image formed through reflection or refraction that can be seen by an observer but cannot be projected on a screen because light from the object does not actually come to a focus.
Diffuse Reflection The reflection of waves in many directions from a rough surface.
Reverberations Persistance of a sound, as in an echo, due to multiple reflections.
Refraction The change in direction of a wave as it crosses the boundary between to media in which the wave travels at different speeds.
Wave Front The crest, trough, or any continuous portion of a 2-D or 3-D wave in which the vibrations are all the same way at the same time.
Mirage A floating image that appears in the distance and is due to the refraction of light in Earth's atmosphere.
Dispersion The separation of light into colors arranged according to their frequency, by interaction with a prism or diffraction grating, for example.
Critical Angle The minimum angle of incidence for which a light ray is totally reflected within a medium.
Total Internal Reflection The 100% reflection (with no transmission) of light that strikes the boundary between two media at an angle greater than the critical angle.
Optical Fibers A transparent fiber, usually of glass or plastic, that can transmit light down its length by means of total internal reflection.
Created by: 1635855241
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