Physics Vocabulary
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| continuous spectrum | a luminous object produces all produces all possible wavelengths of visible light.
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| spectrograph | a photograph, printout, or other display of a spectrum produced by a spectroscope
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| light-year | the distance light travels in a year, approximately 9.5 trillion kilometers
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| intensity | a light source's power, the rate at which it radiates energy
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| candela | the unit of light intensity
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| inverse-square law | a situation encountered many times in physics
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| incandescence | the light produced by materials heated until they glow, it occurs when atoms and electrons rapidly vibrate with thermal energy
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| fluorescence | occurs when a substance radiates visible light as it absorbs a higher-energy source is removed
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| phosphorescence | emit visible light after the energy source is removed, watch dials and glow-in-the-dark stickers are examples
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| coherent light | extremely bright and has many uses in medicine,industry communications, and the military
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| cold light | produced from chemical reactions at temperatures far below those required for incandescence
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| primary hue | the basic color of light: red,yellow, orange,green
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| additive primary colors | red,blue,green
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| subtractive primary colors | cyan,yellow, and magenta
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| complementary color | subtractive primary colors
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| saturation | the brightness of a color
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| value | how dark or light the color appears
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| beam | made of lots of photons moving in the same direction
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| ray | a line with an arrowhead showing direction
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| diffuse reflection | reflection off the surface
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| specular reflections | reflection off a smooth surface
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| incident ray | the light ray approaches a reflective surface
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| reflected ray | the outgoing ray
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| law of reflection | when a light ray reflects off the surface, the angle of the incident ray, equals the angle of the incident ray
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| plane mirror | a standard bathroom mirror
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| virtual image | an image is seen in a position where no real objects exist
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| real image | formed when the rays of light from a source are made to converge or come together by a focusing optical device
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| convave mirror | the deepest point of the dished surface is the center of the mirror
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| principal optical axis | an imaginary line normal to the mirror's surface at this point
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| principal focus | when light rays fall on the mirror's surface, they reflect according to the law of reflection and converge on a point in the front of the mirror
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| focal point | converge to a point in the center of the mirror
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| focal length | the principal focus lies on the optical axis at a distance from the mirror's center
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| convex mirror | a mirror that cannot produce a real image that is also bulged outward
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| optical destiny | the speed of light in a material is related to the material's destiny
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| index of refraction | the ratio of the speed of light in a vacuum to the speed of light in the material
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| total internal refraction | if the angle of incidence is increased
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| critical angle of incidence | the angle of incidence where a phenomena begins
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| fiber optics | an important growing field of technology with diverse applications
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| light depression | a beam of light enters a piece of glass, no matter what it's shaped, some depression takes place
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| lens | a disk of optically clear material that refracts light to produce a real or virtual image
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| converging lens | collects the incoming rays of light and focuses them at a point
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| diverging lens | spreads the rays of light apart similar to a convex mirror
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| meniscus lenses | eyeglass lenses, both sides are curved in the same direction
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Or sort by any of the columns using the down arrow next to any column heading.
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Created by:
Luke Meterko
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