One of the class types of glass is called "crown" glass, which has an index of refraction for visible light of 1.52 and is usually free of significant impurities. It was one of the first glasses discovered, and windows are made from it.  Another glass is called "flint" glass, and it has lead oxide added, which makes it heavier, more "dispersive" and colorful, and   increases its index of refraction to 1.62. 2. For flint glass, what are the angles?

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