Titlebook: Light Calculations and Measurements; An introduction to t H. A. E. Keitz Textbook 1971Latest edition N.V. Philips? Gloeilampenfabrieken, Ei

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IlluminationObviously, the amount of luminous flux falling on an object emitting no light of its own is very important from the aspect of observation of that object. We wish to know, therefore, how strongly an object or a surface is illuminated and the natural course is to express the ., or . (symbol .) in terms of the ..

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Properties of Optical SystemsIn optics, an . is understood to be a system of refracting and/or specular reflecting surfaces, i.e. lenses or mirrors, as used in combination with an . which can be reproduced by the optical system. Here, the object may be a primary or secondary light source.

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General ConsiderationsIn Part I (Ch. XII) we have already defined photometry and the principles upon which it is founded. Let us briefly review these once again. ..

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