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138 A Laser light of wavelength 660nm is used to weld Retina detachment. If a Laser pulse of width 60ms and power 0.5kW is used, the approximate number of photons in the pulse are

Answer» 138 A Laser light of wavelength 660nm is used to weld Retina detachment. If a Laser pulse of width 60ms and power 0.5kW is used, the approximate number of photons in the pulse are


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