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Answer to Question #53724 in Solid State Physics for kavita badiger

Question #53724
a laser beam of wavelength 630 nm coherence width 8x10 -3 m and power 10mw shines on a surface 100 m away. deduce the illumination. compare it with that due to a collimated beam from a torch filament of diameter 0.1 cm , lence of focal length 10 cm and power 10 w
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