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Answer to Question #53759 in Solid State Physics for jaideep

Question #53759
A laser beam of wavelength 6X10-7 m , coherence width 8X10-3m and power 10mW shines on a surface 100m away. Deduce the illumination , compare it with that due to a collimated beam from a torch filament of diameter 0.1cm , lens of focal length 10cm and power 10W.
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