sunlight reflecting from water at 57 degrees is completely polarized. At what ti

Question

sunlight reflecting from water at 57 degrees is completely polarized. At what time must the transmission axis of a polarizer (say your sunglasses) make with the polarization direction of the light to decrease the intensity of the light by a factor of 4? For your information, but not at all useful in the problem, light polarized by reflection has its electric field perpendicular to the plane of incidence, so the polarization direction in along the surface of the water.

QUESTION 2 Sunlight reflecting from water at 57 is completely polarized. At what angle must the transmission axis of a polarizer (say your sunglasses) make with the polarization direction of this light to decrease the intensity of the light by a factor of 4? For your information, but not at all useful in the problem, light polarized by reflection has its electric field perpendicular to the plane of incidence, so the polarization direction in along the surface of the water. Select One of the Following: (a) 60P (b) 450 (c) 75 (d) 5 (e) Toby

Explanation / Answer

Intensity I = (Io/2)*(costheta)^

Io = intentsity of un polarized light

I = intensity of light coming from polarizer= Io/4

Io/4 = (Io/2)*(costheta)^2

(costheta)^2 = 1/2

costheta = 1/sqrt2

theta = 45 degrees

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