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.
Numbers and figures are an essential part of our world, necessary for almost everything we do every day. As important…
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