20 terms

Honors Physics Chapter 16 vocab

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complementary colors
two colors of light that, when combined, produce white light
diffraction
the bending of light around a barrier
illuminance
the rate at which light strikes a surface, or falls on a unit area; measured in lumens per square meter (lm/m²) or lux (lx)
luminous flux
the rate at which light energy is emitted from a luminous source; measured in lumens (lm)
luminous sources
an object, such as the sun or a lightbulb, that emits light
Malus's law
states that the intensity of light coming out of a second polarizing filter equals the intensity of polarized light coming out of a first polarizing filter times the cosine, squared, of the angle between the polarizing axes of the two filters
opaque
a property of a medium that allows that medium to absorb light and reflect some light rather than transmitting it, preventing objects from being seen through it
polarization
production of light with a specific pattern of oscillation
primary colors
red, green, and blue, each of which absorbs one primary color from white light and reflects two primary colors; can be mixed in pairs to produce the secondary colors yellow, cyan, and magenta
primary pigment
cyan, magenta, and yellow, each of which absorbs one primary color from white light and reflects two primary colors; can be mixed in pairs to produce secondary pigments red, green, and blue
ray model of light
represents light as a ray that travels in a straight path, whose direction can be changed only by encountering a boundary
secondary color
yellow, cyan, and magenta, each of which is produced by combining two primary colors
secondary pigment
red, green, and blue, each of which absorbs two or more primary colors from white light and reflects one primary color; can be produced by mixing pairs of cyan, magenta, and yellow pigments
translucent
property of a medium that allows that medium to transmit light and reflect a fraction of the light, preventing objects from being seen clearly through it
transparent
property of a medium that allows that medium to transmit light and reflect a fraction of the light, allowing objects to be seen clearly through it
Doppler shift
Difference between observed wavelength and actual wavelength, used to determine whether Earth is moving closer to or farther away from a star
Illuminated source
Becomes visible when light reflects off it
Luminous intensity
(Of a point source) the luminous flux that falls on 1 m^2 of a sphere with a 1-m radius
Polarized
Light that vibrates in a single plane
Observed light frequency
Describes the number of light wave oscillations an observer sees
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