We have proven that radiance does not go down along a


Question: We have proven that radiance does not go down along a straight line in a non-absorbing medium, which makes it a useful unit. Show that if we were to use power per square meter of foreshortened area (which is irradiance), the unit must change with distance along a straight line. How significant is this difference?

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Computer Engineering: We have proven that radiance does not go down along a
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