15 terms

Terms	Definitions
Reflection	the bouncing back of a particle or wave that strikes the boundary between two media.
normal	a line perpendicular to it's 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
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 form the object does not actually come to a focus
diffuse reflection	the reflection of waves in many directions from a rough surface
reverberations	Persistence 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 two media in which the wave travels at different speeds
wave fronts	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
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 lenght by means of total internal reflection.

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• "Reflection" image
• "normal" image
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• "diffuse reflection" image
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• "dispersion" image

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