# Homework Help: Polarization Questions!

1. Nov 5, 2009

### Supertramp19

A beam of unpolarized light (III=IP= I0 and EII= EP= E0) is incident from air on a plane interface of water (n = 1.33).

(a) Under the incident angle of θi = 0°, 30°, and 70°, what is the amplitude (E) and intensity (I) of the reflected beam (relative to the values E0 and I0 of the incident beam) for the two E parts of the light, polarized II and to the plane of incidence?

(b) At what particular angle of incidence will you achieve total linear polarization for the reflected light?

(c) The light refracted into the water in (b) is intercepted by the top flat surface of a block of glass (n = 1.6), which is immersed in the water. The light reflected from the glass back into the water is completely linearly polarized. What is the angle between the glass and water surface?

(d) Plot both particular cases (b) and (c) together in a sketch of the plane of incidence showing the directions of the incident, reflected, and transmitted light beams, and also the polarization direction of the reflected light. Include in your sketch the arrangement ofthe glass block relative to the
water surface. You need not consider any reflections at the bottom of the glass block.

Note: II means parallel and P means perpendicular.

I know it's a lot to ask. Thanks for any help/hints in advance!

2. Nov 5, 2009

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