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First Lessons in Natural Philosophy
Joseph C. Martindale
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Can we see the different colors in the ray itself?
We cannot; because God has so blended them together that they cannot be seen by us.
When most of the rays of light pass through a substance, what is said of it?
The substance is said to be transparent.
Name some transparent substances.
Glass, ice, diamonds, air, and clear water.
When only a few rays of light pass through a substance, what is said of it?
The substance is said to be translucent.
Name some translucent substances.
Flint, isinglass, scraped-horn, and china-ware.
When no rays of light pass through a substance, what is said of it?
The substance is said to be opaque.
Name some opaque substances.
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