As a check, the guiding rule is that light entering a transparent material such as glass takes a path bent more toward the normal inside than it had outside. In reverse, light exiting a transparent material into air or vacuum takes a path farther from the normal when outside than it had when inside. In your own words use Snell's law to explain this.
Snell's Law and the Law of Reflection explain how light is redirected when it encounters a surface between two media. In the extreme, light may only reflect at a boundary, and go back into the medium it was in. More often, some of it reflects and some goes through. If the boundary is plane and flat, then these laws are easy to interpret. When the boundary is curved, they describe what happens at every point on the surface.
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.
1. As a check, the guiding rule is that light entering a transparent material such as glass takes a path bent more toward the normal inside than it had outside. In reverse, light exiting a transparent material into air or vacuum takes a path farther from the normal when outside than it had when inside. In your own words use Snell's law to explain this.
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