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Answer to Question #53374 in Solid State Physics for madhu

Question #53374
A laser beam of wavelength 6 x 10 in, coherence width 8 x 10 'in and power 10mW shines on a SMarks surface l00m away. Deduce the illumination. Compare it with that due to a collimated beam from a torch filament of diameter 0.1 cm, lens of focal length l0cm and power 10W.
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