This book is based on new academic research in higher education. It mainly deals with the radiation energy, emitted by uniform point-sources, striking 2-D & 3-D objects in the space and advanced knowledge of Geometry & Trigonometry. 1. A new theory of solid angle with basic & applied fundamentals of Geometry, Trigonometry, Calculus & Photometry/Radiometry. 2. Solved examples of numerical problems 3. Chapter wise summary & long exercise & 4. Wide applications of solid angle in Geometry, Photometry/Radiometry & Space science.
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