Light reflected at 55.0 degree from a window is completely polarized. a) What is

Question

Light reflected at 55.0 degree from a window is completely polarized. a) What is the window?s index of refraction of the glass of the window? When using a light meter, if was found that the intensity of this reflected light, at the position of the meter is 9OCd. A linear polarizer is then placed between the meter and the window with its axis making an angle of 35 degree with the axis of polarization of the reflected light. b) What is in Cd, the intensity measured by the meter then? A second linear polarizer is then placed between the meter and the first polarizer. It was oriented such that its axis makes an angle of 42 degree with the axis of polarization of the first polarizer. c) What is in Cd, the intensity measured by the meter then?

Explanation / Answer

A.

This refers to the Brewster's angle,

55 deg = Arctan (nglass/nair)

Thus,

nglass = 1.4281   [ANSWER]

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I = 90 cos^2 35 = 60.39 Cd   [ANSWER]

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The second polarizer then makes 35 + 42 = 77 deg with respect to the axis of the reflcted light. Thus,

I = 90 cos^2 77 cos^2 42 = 2.515 Cd   [ANSWER]

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