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The illuminance of a small area changes from 900 lumen m−1 to 400 lumen m−2 when it is shifted along its normal by 10 cm. Assuming that it is illuminated by a point source placed on the normal, find the distance between the source and the area in he original position . |
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Answer» The illuminance of a small area changes from 900 lumen m−1 to 400 lumen m−2 when it is shifted along its normal by 10 cm. Assuming that it is illuminated by a point source placed on the normal, find the distance between the source and the area in he original position . |
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