Sky and Polarization

From: =?ISO-2022-JP?B?GyRCMng/TRsoQg==?= <>
Subject: Sky and Polarization
Date: Sun, 6 Oct 1996 21:00:04 +0900 (JST)

Dear discuss-lfm members,
                       <<DO your experiments>>

1. 90 deg scattering the blue sky is polarized. Look at the blue sky
through a polaroid. 

How to get polaroid: Electronic calculator (Liquid crystal equipments)
use polaroid. Take off!

2. Look at the rainbow through the polaroid. What a beautiful! Try it.

3. Half moon is scattering sunlight through 90 deg to you.
Is the half moon light polarized? 

4. What is Brewster's angle?