Answer:
0.04973 W
Explanation:
I = Intensity of laser = [tex]3.69\times 10^4\ W/m^2[/tex] (assumed, as it is not given)
d = Diameter of spot = 1.31 mm
r = Radius = [tex]\dfrac{d}{2}=\dfrac{1.31}{2}\ mm[/tex]
A = Area = [tex]\pi r^2[/tex]
Power is given by
[tex]P=IA\\\Rightarrow P=3.69\times 10^4\times \pi \dfrac{(1.31\times 10^{-3})^2}{4}\\\Rightarrow P=0.04973\ W[/tex]
The power output of the laser is 0.04973 W
