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a. The sun subtends an angle of 0.5 at the earth's surface, where the illuminance is about 105 lx at normal inci- dence. Determine

a. The sun subtends an angle of 0.5 at the earth's surface, where the illuminance is about 105 lx at normal inci- dence. Determine the luminance of the sun. b. Determine the illuminance of a horizontal surface under a hemispherical sky with uniform luminance L.

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