1. The Sun is directly overhead and you are facing toward the north. Light comin
ID: 1788683 • Letter: 1
Question
1. The Sun is directly overhead and you are facing toward the north. Light coming to your eyes from the sky just above the horizon is
a. partially polarized north-south
b. partially polarized east-west
c. partially polarized up-down
d. lineraly polarized up-down
2. For light shining onto a surface at Brewster's angle, the angle between the light reflected off the surface and the light transmitted into the surface is
a. 0*
b. 180*
c. 90*
d. depends on the index of refraction, n, of the medium
3. how much brighter is blue sky at 350 nm than at 800 nm
a. 2x
b. 25x
c. 0.04x
d. it's the same brightness
Explanation / Answer
The Sun is directly overhead and you are facing toward the north. Light coming to your eyes from the sky just above the horizon is
b. partially polarized east-west
When refracted ray is partly polarized because it has more light in the plane of the horizon than perpendicular to it.
If the angle of incidence is the Brewster angle then the reflected ray is partly polarized.
2. Brewster angle is the special angle when angle between the light reflected and transmitted is 90 degree
Brewster angle is 90 degree. So option (c) is correct.
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