unpolarizedlight with brightness lg encounters a polarizer which s oriented appr

Question

unpolarizedlight with brightness lg encounters a polarizer which s oriented approximately vertically leting through only verticaily polarized light. This is then passed through a second polarizer oriented at an angle of to the first polarizer. The person on the right receives only about 13 of the original light (i.e., he observes an intensity of 10 /3). What is the approximate angle, , of the second polarizer? (Hint:use Malus's Law Unpolarized light Polarizer Analyzer Polarized Transmissionlight axis 570 B. 170 C. 70o D. 0o

Explanation / Answer

Since average internsity of light after passing through first polaroid becomes half of the intensity of unpolarized light

so Intensity after 1st Polaroid = Io/2

Intensity after 2nd Polaroid = (Io/2)cos²()

So (Io/3) = (Io/2)cos²()

So cos²() = 2/3

So cos() = 0.816

= cos-1(0.816) = 35.26°

don't know why this option is not there but this is correct.

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