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Light Unit
study guide for Light test 12/2010
Question | Answer |
---|---|
what are the three characteristics of light? | it is invisible unless detected; detection of light requires interaction with matter (dust, eyes); light spreads out as it moves from a light source |
what does opaque mean? | no light can pass through |
what does transclucent meant? | some light can pass through |
what does transparant mean? | all light can pass through |
what is a shadow? | the absence of light |
what is the visible spectrum? | a mix of colored light; white or visible light |
what is the correct order of colors in the visible spectrum? | ROY G BIV |
what color is the most easily refracted color of the visible spectrum? | blue |
what color is not as easily seen by the human eye? | red |
how do you see certain colors when looking at them? ex: why do we see green when looking at grass? | grass reflects green and absorbs the all the other colors |
how do we see white? | white absorbs no colors of the spectrum |
how do we see black? | black absorbs all the colors of the spectrum |
what are the three primary colors of light? | red green blue |
what is a lens? | an object, usually made of glass, that is made to refract light in a specific way |
what are the two main types of lenses? | convex (makes objects look larger) and concave (makes objects look smaller) |
what type of lens does the human eye have? | convex |
what colors have the longest wavelength and the shortest? | longest: red shortest: blue |
what does a triangular prism do? | changes white light to make colored light |
what are the five main sources of light? | fire, lightening, sun, lightening bugs, light bulbs |
relfection | the bouncing of light from a surface |
refraction | the bending of light that moves from one material to another |
crest | the top of the wave |
trough | the bottom of the wave |
wavelength | the distance from crest to crest |