Electrical Engineering · Illumination Engineering
In the point-to-point method of illumination calculation, when the vertical height of the light source above a horizontal plane is constant, the illuminance at any point on that plane is proportional to which power of the cosine of the angle of incidence?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Fourth power
- 2Third power✓
- 3Second power
- 4First power
Correct answer
Third power
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