Properties of optical glass
Answers
Answer:
The index of refraction and Abbe number of a glass are typically used by designers as degrees of freedom when designing systems. The index of refraction refers to the ratio of the speed of light in a vacuum to the speed of light through a given material at a given wavelength, while the Abbe number of a material quantifies the amount of dispersion (variations in index) for a specific spectral range. For instance, a higher index of refraction generally bends light more efficiently so there is less of a need of curvature in the lens. Spherical aberration is less present in lenses with higher indices of refraction, while light travels faster through materials with lower indices of refraction. A high Abbe number generally gives less color dispersion and reduces color aberration. Also, certain glass types have different transmission wavelength regions.
Answer:
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Explanation:
Today, the quality and integrity of optical glass is a fundamental assumption made by optical designers. Nearly 125 years ago, Otto Schott began a revolution by systematically researching and developing glass compositions. His development work on composition and the production process took glass manufacturing from the realm of trial and error to its state today as a truly technical material. Now optical glass properties are predictable, reproducible and homogeneous - the essential prerequisites of a technical material. The fundamental properties that characterize optical glass are refractive index, dispersion, and transmission.