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Essmyer Ch.29 Vocab

the bouncing back of a particle or wave that strikes the boundary between two media. reflection
a line perpendicular to a surface. normal
angle between an incident ray and the normal to a surface. angle of incidence
angle between a relected ray and the normal to a surface. angle 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 refected waves. law of reflection
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. virtual image
the reflection of waves in many directions from a rough surface. diffuse reflection
persistence of a sound, as in an echo, due to multiple reflections. reverberation
the change in direction of a wave as it crosses the boundary between two media in which the wave travels at different speeds. refraction
the crest, trough, or any continuous portion of a two-dimensional or three-dimensional wave in which the vibrations are all the same way at the same time. wave front
a floating image that appears in the distance and is due to the refraction of light in Earth's atmosphere. mirage
the separation of light into colors arranged according to their frequency, by interaction with a prism or diffraction grating, for example. dispersion
the minimum mass of fissionable material in a nuclear reactor or nuclear bomb that will sustain a chain reaction. critical angle
the 100% reflection with no transmission of light that strikes the boundary between two media at an angle greater than the critical angle. total internal reflection
a transparent fiber, usuallyof glass or plastic, that can transmit light down its length by means of total internal reflection. optical fiber
Created by: essmyer