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23 Cards in this Set

  • Front
  • Back
range of frequencies of electromagnetic waves that stimulates the retina of the eye, travel in a straight line in a vacuum or other uniform medium
Light waves have wavelengths from...?
400 nm to 700nm, shortest wavelength are seen as violet
Ray model
ignores "wave" nature of light, useful to describ ehow light is reflected or refracted
Speed of light
299,792,458 m/s or 3.00 x 10^8 m/s, thought light was instantaneous, late 1600's--found light has a finite speed, early 1900's--speed of light 2.997996 plus or minus 0.00004 x 10^8 m/s but really light is the number above
luminous body
emits light, ex: light bulb
illuminate body
reflects light produced by an outside source, ex: apple, pink car, blue sweater
luminous flux (p)
measures total output of light source, unit=LUMENS (lm)
illuminance (e)
illumination on a surface, measured by lm/m^2 or lux(lx)
luminous intensity
some light sources are measured by "CANDELA" (cd) or candle power, this is a measure of luminous intensity
inverse-square relationship
further away the surface is=more spread out the light will be on surface aka DIMMER
materials transmit light waves without distorting images
materials that transmit light but do not permit objects to be seen clearly through them
transmit no light but absorb or relfect all light incident upon them
ordered arrangement of wavelengths
primary colors
red, green, blue light
secondary colors
yellow, cyan, magenta
complementary colors
two colors of light which when added together produce white light
a colored material that absorbs certain colors and reflects/transmit other colors
primary pigment
a pigment that absorbs only one color from white light
secondary pigment
a pigment that absorbs two primary colors from white light and reflects one
thin film interference
result of constructive and destructive interference of light waves
half the light passes through and the intensity of that light is reduced by half
a molecule that absorbs some light wavelengths and reflects or transmits others