Фотометрия [Nature Category:
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The most important words from all discussions“Фотометрията е раздел на приложната оптика и представлява наука за измерване на яркостта на светлината по начина, по който се възприема от човешкото око, или с други думи провеждане на количествени измервания на енергийните характеристики на излъчването. Тя е различна от радиометрията, която е наука за измерване на лъчистата енергия по отношение на абсолютната мощност. Като наука фотометрията възниква през 18 век. …” (Wikipedia) (Wikipedia translated)
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