## The photic fieldThe Photic Fieldbrings a formal elegance and completeness to the portion of geometrical optics that deals with amounts of radiant energy. Since the time of Lambert, this discipline has been handled piecemeal by a great variety of methods. But by utilizing the full potentialities of field theory, the book unifies the subject and forges a powerful tool for handling practical applications. Such applications include solar heating, lighting design, photographic exposure, and color specification. The pharosage vector is used throughout the book, and divergence, curl, and gradient are employed. Potentials and quasi-potentials are important, and contour integration allows a double integral to be replaced by a single integral. These and other aspects of field theory will allow the reader to solve photometric problems that were previously difficult to formulate. Many of the formulations in geometrical optics, although conceptually clear, are computationally unwieldy. As a result, researchers until quite recently have had to rely on a scattered collection of rules of thumb and approximation methods. But now, with the general availability of computer, exact solutions are within range, and thus many of the equations given in The Photic Fieldmay be directly applied almost for the first time. |

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### Contents

Physical and Geometrical Optics | 1 |

Basic Concepts | 18 |

The Reflectance Holor | 41 |

Copyright | |

8 other sections not shown

### Common terms and phrases

according to Eq analytic apply approximation axis boundary conditions calculated Chapter circular-disk source colorimetry const contour integral Coordinate surfaces coordinate system cos2 curl curlD cylinder D. E. Spencer direction disk divD evaluated example expressed field map Field Theory Handbook flux lines geometrical optics gives grad helios H holor Ibid incident pharosage interflections irradiated Laplace equation lightcone linear linearly polarized Maxwell's equations merates Moon and D. E. Moon and Spencer Nonspecular peak obtained orthogonal Pearson curve perfectly diffusing pharosage vector photic field photometric system plane plane-angle method Poisson equation polarized radiation polygonal source quasipotential radiant power rectangular apertures rectangular source result scalar potential Section shown in Figure solid angle solid-angle method solution source of uniform spherical source surface integral Table Theory for Engineers Torrance and Sparrow total pharos uniform H uniform helios unpolarized values vector potential watt m-2 weighting function