| http://www.w3.org/ns/prov#value | - Light from a source 73 such as a tungsten-halogen filament lamp or a laser, is passed through a narrow band filter 75 designed too pass light at a desired wavelength, then through a polarizer 77 and then brought to focus by lens 79 on the sample S. If source 73 is a laser whose output is sufficiently polarized then polarizer 77 may be eliminated.
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