Light reflected at 55.2 degree from a window is completely polarized. a) What is

Question

Light reflected at 55.2 degree from a window is completely polarized. a) What is the window's index of retraction 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 32 with me axis of polarization of the reflected light. b) What is an 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 mat its axis makes an angle of 38 degree with the axis of polarization of the first polarizer. c What is in Cd, the intensity measured by the meter then?

Explanation / Answer

For linear polarization

@i + @t = 90

Where @i = angle of incidence or angle of relfection

@t = angle of refraction

Where @i = tan-1 ( nwindow / nair)

tan@i = ( nwindow / nair)

  ( nwindow / 1) = tan55.2

nwindow  = 1.438

b) According to Malus law

I1 = Io cos2@

= (90 Cd ) (cos32)2

= 64.72 Cd

c)   

I2 = I1 cos2@

= (64.72 Cd ) (cos38)2

= 40.19 Cd

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