Electromagnetic%20Radiation

Electromagnetic%20Radiation - Electromagnetic Radiation Now...

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Unformatted text preview: Electromagnetic Radiation Now you see it, now you dont Important Concepts Dispersion variation of RI with wavelength Refractive Index bending of light Refractometer Measuring principle: A high resolution optical sensor measures the total reflection of a light beam emitted by a special LED light source after hitting the sample. This total reflection is converted into refractive index Important Concepts Visible light consists of only a very narrow portion of the entire electromagnetic spectrum A color of visible light includes a number of wavelengths (a band) Wavelength crest to crest distance (in nanometers 1 x 109) The shorter the wavelength the greater the energy Isotropic vs. Anisotropic Isotropic only one RI value no matter the orientation in polarized light (cubic xtals, glass) Anisotropic (birefringent) RI varies with orientation in polarized light (non-cubic xtals, fibers, polymers) Polaroid filter Check Your Understanding...
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Electromagnetic%20Radiation - Electromagnetic Radiation Now...

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