5.(5 pts) A collimated beam (parallel rays, non-spreading and non-focusing) of u

Question

5.(5 pts) A collimated beam (parallel rays, non-spreading and non-focusing) of unpolarized natural") light from a flashlight has initial intensity (. The beam then passes through three successive plane polarizers: a vertical polarizer, then a polarizer oriented at 35.0 to the vertical, then a polarizer oriented at 75.0 to the vertical. ess your final Find the final intensity of the beam of light that emerges from the third polarizer, in terms of lo. Etp answer as a decimal fraction of I, to 3 significant figures. Show your work. (Hint: Be sure to use the correct angle in each application of Malus. Law!)

Explanation / Answer

INITIAL intensity of unpolarised light = Io
intensity of unpolarised light after 1st polariser = Io/2
polarisation after first polariser = vertical
after second polariser, I = (Io/2)cos^2(35) ( from malus law)
after third polariser, I = (Io/2)cos^2(35) cos^2(75 - 35)
hence
I = 0.1968824Io

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