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ch 29 physics

PHYSICS VOCAB

QuestionAnswer
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 suface
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 tot he angle of reflection this is true for both partially and totally reflected waves.
virtual images 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 wavaes 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 differnt speeds
wavefront the crest, trough, or any continuous portion of a two-demensional or three demensional wave.
mirage a floating image that appears in the distance and is to the refraction of light on earths atmospheres
dispersion the separation of light into colors arranged according to their frequency. interaction with prism.
critical angle the minimus angle of incidence for which a light ray is totally reflected within a medium
total internal reflection the 100% reflection of light that strikes the boundary between two media at an angle greater than the critical angle.
optical fiber a transparent fiver, usually of glass or plastic, that can transmit light down its length by means of total internal reflection.
Created by: Wardlaw