Take a large beaker or bottle and fill it with water. Add a small amount of nonfat powdered milk and stir until the water turns a faint milky white. Shine white light into the beaker, and, on the opposite side, hold a white piece of paper.
(a) Explain why the milk has a blue cast to it and why the light shining on the paper appears ruddy.
(b) What do you know about the size of the milk particles?
(c) How does this demonstration relate to the color of the sky and the color of the sun — at sunrise and sunset?
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