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Unformatted text preview: 9-17-07Exam next week.3 = one stopLight in PhotometryLight is fundamental to photographyCreate light with lampsMeasure light with metersControl light with filters, shutters, lensesRecord patterns of light onto photographic materials to give us imagesWhat is light-Where does it come fromWhat: the form of radiant energy that our eyes are sensitive to and depend upon for he sensation of visionTo create light, another from of energy must be suppliedLight is emitted from a source in straight lines as a stream of particles (Isaac Newton)What in this theory does not explain things we see in Photography?Light doesnt travel in straight linesDoesnt explain how light bends with passing from one medium to anotherLight spreads out after passing though a very small apertureLight and similar forms of electromagnetic radiation are transmitted as a waveform in some media (Christian Huygens)Explains many of the phenomena that the Corpuscular did not, butProblem: does not explain the behavior of black-body radiationBlackbody radiationThe radiation produced by a body that absorbs all the radiation that strikes it, and emits radiation by incandescence, depending on its temperatureBlackbody comparisons are used to assign color temperatures to light sourcesA tungsten light bulb is a good simulator of a blackbodyLight wavesLight travels in waves and is a fractional part of all radiant energy.Travels at a speed of 186,000 miles per second differing only in wave lengthsWavelength: distance from one peak to the next measure in nanometers (nm)Frequency: number of waves passing a given point is a secondVelocity of radiation (v) Quantum theory1900 Max PlanckThe only possible energy that can be possessed by a ray of light is integral...
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This note was uploaded on 04/21/2008 for the course M&P 071 taught by Professor Salvaggio during the Fall '07 term at RIT.
- Fall '07