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  • camera obscura

    term for a device that was long used to observe eclipses; a dark chamber into which light is admitted through a narrow aperture in one wal

    Alhazen

    Arab scholar often regarded as the father of scientific optics; the first to clearly state that light actually comes to our seeing eyes from objects illuminated by a source

    rectilinear propagation

    term for light's property of traveling in a straight line

    corpuscles

    term for the streams of particles that made up light, according to Newton

    interference

    term for light's property of alternating bright and dark bands when a light is shone through two adjacent pinholes

    waves, wavelike

    Since interference is exhibited by _____ not by moving particles, Young argued that light must be ______.

    infrared rays

    term for invisible rays that have a frequency below the frequency of red light (have long wavelengths and low frequencies)

    ultraviolet rays

    term for invisible rays that have a frequency beyond that of violet (have short wavelengths and high frequencies)

    color

    term for our perception of the frequency of light

    ROY G. BV

    the mnemonic device for the six colors of light that can be distinctly seen

    solar spectrum

    term for the six colors of light, which are obainable from the white light of the sun

    monochromatic

    term for light of a single frequency or within a narrow range of frequencies corresponding to the same color

    composite light

    term for two or more monochromatic lights that are mixed

    additive mixing

    term for blending two or more kinds of monochromatic light

    white

    the sum of all colors of light

    black

    the absence of all colors of light

    red, green, and blue

    the primary colors of light

    primary colors

    term for the three colors of light that, when mixed in equal amounts, make white

    secondary colors

    term for colors of light that are blends of two primaries in equal amounts

    complementary colors

    term for any two colors whose additive mixture is white

    the light reflected from an object's surface

    What determines an object's color?

    transparent

    If a surface belongs to an object made of a _____ material, most of the light travels through the object-- that is, most of the light is transmitted.

    opaque

    When light falls on a nontransparent, or ____, material, the individual rays are either reflected or absorbed.

    color filter

    term for a sheet of material that is transparent to some frequencies and opaque to others

    gray

    the color of a surface that reflects between 10% and 80% of the light at any frequency

    hue

    term for the qualitative aspect of color

    pure color

    term for a color without any shading or tinting

    brightness

    term for our subjective response to the intensity of reflected light

    pigments

    term for dyes and paints

    subtractive mixing

    term for mixing paints on a palette

    secondary colors and subtractive primaries

    two terms for cyan, magenta, and yellow

    subtractive secondaries

    term for red, green, and blue when they are obtained by subtractive mixing

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