Question

1. Suppose you bought a red laser pointer (a cheap one you'd buy to play with a cat, not something you'd buy to try to light something on fire 3 miles away) (a) Look up online typical values for the power and wavelength of this kind of laser. (b) Estimate the radius of the beam. From this and the power in part (a), find the intensity of the laser light. (c) What are the electric field amplitude and the magnetic field amplitude? (d) If this light is shining on your friend and the light is completely absorbed, what force would your friend feel? If you get an answer like 100 Newtons, something probably went wrong, since you largely don't notice a push or pull when laser light is shining on you 2. Unpolarized light is incident on two polarizers: the first is along the y axis, and the second is along an axis that makes an angle of 30.0° with respect to the y axis. The initial intensity of the light is 100.0 W/m2 has passed through the second? (b) What is the intensity of the light after it has passed through the second polarizer?

Answer 1

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