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Answer on Solid State Physics Question for yashoda

Question #53237
A laser beam of wavelength 6x10-7m, coherence width 8x10-3 m 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 0.1 cm, lens of focal length 10cm and power 10W.
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