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Kohl 29 Terms

vocabulary

QuestionAnswer
reflection bouncing back of a particle or wave that strikes a boundary between two media
normal a line perpendicular to a surface
angle of incidence angle between the incident ray and the normal
angle of reflection angle between the reflected ray and the normal
law of reflection The angle of incidence equals the angle of reflection.
virtual image an upright image formed by reflection or refraction that cannot be projected onto a screen
diffuse reflection the reflection of waves in many directions from a rough surface
reverberation persistance of sound, as in an echo, due to multiple refections
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 front lines drawn to represent crests of waves, drawn perpendicular to the direction the wave is traveling
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 minimal angle of incidence for which a light ray is totally reflected within a medium
total internal reflection the 100% relection of light stat 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: mkohl