You direct a 12.0 mW laser beam toward a reflecting surface at normal incidence.

Question

You direct a 12.0 mW laser beam toward a reflecting surface at normal incidence. The cross section of the beam has a diameter of 2.00 mm when it arrives at the surface. If 83% of the beam is reflected from the surface, what is the total pressure on it due to the incident and reflected energies? You direct a 12.0 mW laser beam toward a reflecting surface at normal incidence. The cross section of the beam has a diameter of 2.00 mm when it arrives at the surface. If 83% of the beam is reflected from the surface, what is the total pressure on it due to the incident and reflected energies? You direct a 12.0 mW laser beam toward a reflecting surface at normal incidence. The cross section of the beam has a diameter of 2.00 mm when it arrives at the surface. If 83% of the beam is reflected from the surface, what is the total pressure on it due to the incident and reflected energies?

Explanation / Answer

intensity s = p/A = 12*10^-3/3.14*(1*10^-3)^2

s = 3821.6 W/m^2

relation between pressure and intensity is

P = (1+f)s/c

where f is the amount of the incident beam reflected

during the replection f = 0.83

total pressure is due to absorption and re emmision

P = (1+0.83)*3821.6/3*10^8

P = 2.33*10^-6 N/m^2

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