A small radiant source A1emits diffusely withan intensity
Chapter 12, Problem 12.8(choose chapter or problem)
A small radiant source A1emits diffusely withan intensity I1?1.2?105W/m2?sr. The radiationdetector A2is aligned normal to the source at adistance of Lo?0.2 m. An opaque screen is posi-tioned midway between A1and A2to prevent radia-tion from the source reaching the detector. The smallsurface Amis a perfectly diffuse mirror that permitsradiation emitted from the source to be reflected intothe detector.(a) Calculate the radiant power incident on Amdue toemission from the source A1, q1lm(W).(b) Assuming that the radiant power, q1lm, is perfectlyand diffusely reflected, calculate the intensity leav-ing Am, Im(W/m2?sr).(c) Calculate the radiant power incident on A2due tothe reflected radiation leavingAm, qml2(?W).(d) Plot the radiant power qml2as a function of the lat-eral separation distance yofor the range 0yo0.2 m. Explain the features of the resulting curve.
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