A horizontal laser beam, with intensity 5 watt/m², is directed at the center of a square vertical mirror. The dimension of the mirror is 10 m by 10 m. The cross section of the laser beam is circular with radius 0.2 m. 

(a) Calculate the radiation pressure on the mirror.

Figure 1 shows the circular cross section (radius 0.01 m) of a 2-watt laser beam. The cross section is in the x-y plane, where the +z axis is pointing towards you. The laser is a sinusoidal plane EM wave that is propagating in the +z direction.

(a) What is the intensity of the laser?

At a large distance r from the source, the amplitude of a sinusoidal spherical EM wave is proportional to

Two sheets of polaroids are glued together. The transmission axes of the polaroids are perpendicular to each other. If you shine unpolarized light on the polaroids, the transmitted intensity is

Which of the following general property of electromagnetic wave is FALSE?

Question 4 (cont.)

(e) On the surface bounded by the lower loop, the direction of the magnetic field produced by the current induced in the lower loop is