Tag Archives: diameter
A small laser used as a pointer produces a beam of red light 7 mm in diameter, and has a power output of 8 mil?
A small laser used as a pointer produces a beam of red light 7 mm in diameter, and has a power output of 8 milliwatts. What is the magnitude of the electric field in the laser beam? The intensity of the beam I = P/A = 8.0×10^-3W/(pi*r^2) = 8.0×10^-3/(pi*(3.5×10^-3)^2) = 208W/m^2 The intensity is also [...]