twardsfrom a source in straight lines, it is clear that a less amount ofenergy will fall on a given area at a distance from the sourcethan is incident on the same area when moved closer to thesource. We can investigate the law of this diminution onthe assumption that the energy travels outwards in… … Place a second screen behind the first and let the linesOA, OB, 00, OD produced cut this second screen in A^C^,respectively. Then the amount of radiation which wouldfall on ABCD if there were no hole is intercepted by 162-163] TRANSMISSION OF HEAT BY RADIATION. 193 ^ it is thus distributed over a…
Heat · Light
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