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A transparent material shaped to refract light, such that it converges or diverges from a single point.
A transparent material shaped to refract light, such that it converges or diverges from a single point. Lenses for optical light are usually made of glass or hard plastic, and have probably been in use for over 3000 years.
Lenses for optical light are usually made of glass or hard plastic, and have probably been in use for over 3000 years