A 1.0-mW laser has a beam radius of 0.6 mm . What is the intensity of this beam?
S = ?
Intensity = Power / Area
I = P/A
I = P / pi*r^2
I = 10^-3 / pi*(0.6*10^-3)^2
I = 884.2 W/m2
so the intensity of the beam is 884.2 W/m2
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