The intensity of a wave:
Area A = πr2
Intensity is inversely proportional to area.
Since power is conserved:
P1 = P0
I1A1 = I0A0
A = π(d/2)2
A laser beam has intensity I0.
a. What is the intensity, in terms of I0, if a lens focuses the laser beam to 1/10 its final diameter?
b. What is the intensity, in terms of I0, if lens defocuses the laser beam to 10 times its initial diameter?
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