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Laser

Forums: Lazy Student
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cenpaul07
 
Reply Sat 21 Sep, 2013 08:42 am
Sir,
Please help me with this question
"A laser beam of wavelength 7500 A° has an apperture 6.5*10^-3 metre . It has a power of 40 milli Watt and it is focused by a lens of focal length 15 cm .Calculate the area and intensity of the image "
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