Electrical Engineering · Illumination Engineering
प्रदीप्ति गणना की बिंदु-दर-बिंदु पद्धति (Point-to-point method) में, जब क्षैतिज तल के ऊपर प्रकाश स्रोत की ऊर्ध्वाधर ऊंचाई स्थिर होती है, तो उस तल पर किसी भी बिंदु पर प्रदीप्ति (Illuminance) आपतन कोण के कोसाइन (cos θ) की किस घात के समानुपाती होती है?
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