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The Abbe number is a measure of the dispersion of a transparent material, with high values indicating low dispersion. It is used in lens design and classification of glasses, and can be calculated from the refractive indices at different wavelengths.
A corrective lens is a device that improves visual perception by correcting refractive errors. Learn about the different types of corrective lenses, such as glasses, contact lenses, intraocular lenses, and their prescriptions, uses, and advantages.
Learn about the diffraction limit of optical instruments, such as microscopes, telescopes, and cameras, and how it depends on wavelength, aperture, and numerical aperture. Find out the formula for the Abbe diffraction limit and its applications in astronomy, laser, and digital photography.
When the imaging system obeys the Abbe sine condition, the ratio of the sines of these angles equal the (lateral absolute) magnification of the system. In optics , the Abbe sine condition is a condition that must be fulfilled by a lens or other optical system in order for it to produce sharp images of off-axis as well as on-axis objects.
Chromatic aberration, also called chromatic distortion, is a failure of a lens to focus all colors to the same point. It is caused by dispersion, the variation of refractive index with wavelength, and can be reduced by using achromatic lenses, diffractive elements, or increasing focal length.
A condenser is an optical lens that renders a divergent light beam from a point light source into a parallel or converging beam. The Abbe condenser is named for its inventor Ernst Abbe and is mounted below the stage of the microscope. Learn about other types of condensers and their applications.
Crown glass is a type of optical glass with low refractive index and dispersion, used in lenses and prisms. Learn about its history, types, and applications in optics and astronomy.
A refractometer is a device for measuring the index of refraction of transparent substances, which can be used to determine their concentration, purity or identity. Learn about the different types of refractometers, their principles, uses and examples in various fields such as gemology, medicine, aquaculture and brewing.