An Industrial CO₂ Laser Produces a Beam of Radiation with Average

An industrial CO₂ laser produces a beam of radiation with average power of 5.60 kW at a wavelength of 10.6 $\mu$ m.Such a laser can be used to cut steel up to 25 mm thick! The laser light is polarized in the x-direction,travels in the positive z-direction,and is collimated (neither diverging or converging) at a constant diameter of 148 $\mu$ m.The laser light is completely absorbed by small spherical dust particle with diameter of 50 $\mu$ m.What is the force that the laser beam exerts on the dust particle (before it is incinerated!) ?

A) 3.2 * 10^-6 N
B) 4.2 * 10^-6 N
C) 8.6 * 10^-6 N
D) 1.9 * 10^-5 N
E) 2.1 * 10^-6 N