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March 30, 2017

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Intensity of the HeNe laser (lambda = 632nm) was measured at 2 distances: 1m and 200m from the laser. The meter reading was 10W and 1W correspondingly. How many photons/sec will enter your eye if you look into the laser from 1m? From 2m? Assume that radius of the pupil was 2.4mm, radius of the detector was 3.5mm. At a distance of 1m the laser beam radius was 1mm.

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