I recently purchased a new telephoto lens for my camera. One of the lenses is made of fluorite, and the other is made of a special low-dispersion optical glass. This means that the light passing through the lens is not broken up into its corresponding colors. While great for photography, it would not be ideal for a gemstone. Which of the following gemstones would make the worst lens? a. Lapis Lazuli
b. Quartz
c. Diamond.
d. Demantoid
e. Goshenite

If you could drill a hole straight to the center of the earth, and keep track of what the hole is going through, youwould find: a) you would go through one sort of material, and then a different, denser material, and then a still-different, still-denser material, because the planet is made of concentric layers, sort of like an onion.b) you would go through one sort of material all the way to the center, because the planet is all mixed up.c) if your hole started at the north pole, you would go through different layers of different materials, but ifyour hole started at the equator, you would go through one sort of material all the way to the center.d) if your hole started at the equator, you would go through different layers of different materials, but if yourhole started at the north pole, you would go through one sort of material all the way to the center.e) you would strike diet pepsi when you got to the center.