A lens is a curved piece of a transparent material such as glass or plastic.
A lens is similar to a mirror except light is refracted, not reflected.
A lens has an optical axis which divides the lens in half.
The point on the optical axis where distant light rays meet when refracted, is called
the focal point.
The distance from the focal point to the lens is called the focal length, f.
There is a focal point on both sides of the lens.
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