Photolysis (Chemistry) -- See Photochemistry Here are entered works on the chemical action and influence of light. Works on chemical processes employed in photography are entered under the heading Photographic chemistry.
Photometry -- See Also the narrower term Astronomical photometry Here are entered works on the determination of light intensities of heavenly bodies, including stars. Works on the art of measuring the position, distance, motion, etc., of the stars are entered under Astrometry.
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Photometry, Astronomical -- See Astronomical photometry Here are entered works on the determination of light intensities of heavenly bodies, including stars. Works on the art of measuring the position, distance, motion, etc., of the stars are entered under Astrometry.
Photos -- See Photographs Here are entered works that discuss photographs themselves as objects of special interest, including their classification, cataloging, copying, coloring, mounting, etc. --subdivision Photographs under subjects for works that consist of actual, i.e. not reproductions of, photographs
