Physics 2 Quiz
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WAVES AND OPTICS
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A point source emits light of total power PP isotropically. A flat, perfectly absorbing detector of area AdA_d is oriented so that its normal makes an angle θ=60°\theta = 60° with the radial direction from the source, and the detector is at distance rr from the source. A student argues: 'The power intercepted by the detector is PAdcos⁡θ/(4πr2)P A_d \cos\theta / (4\pi r^2).' A second student counters: 'The cosine factor should not appear here because intensity from a point source is the same in all directions, so orientation is irrelevant.' Which of the following correctly evaluates both students' claims?
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