Member since September 21, 2013

cenpaul07

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cenpaul07
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Laser
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... (view)
 
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