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.