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Photometry and Geometrical Optics

Problem 5.39

How does the luminance of a real image depend on diameter \(D\) of a thin converging lens if that image is observed (a) directly; (b) on a white screen backscattering according to Lambert's law?

Reveal Answer
 (a) Is independent of D;(b) is proportional to D2 . \text { (a) Is independent of } D ;(\mathrm{b}) \text { is proportional to } D^{2} \text { . }
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