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Learn about the different types of optical prisms, such as dispersive, reflective, beam-splitting and polarizing prisms, and how they refract, reflect or split light. Find out how prisms are made of transparent materials like glass, acrylic or fluorite, and how they can create spectra, images or polarizations.
Optical glass is a type of glass suitable for optical systems such as lenses, prisms or mirrors. It contains additives to modify its optical or mechanical properties, such as refractive index, dispersion, transmittance and thermal expansion.
Learn about different types of corrective lenses, such as glasses, contact lenses, and intraocular lenses, and how they are prescribed by eyecare professionals. Find out how to choose the right lens for your vision needs, whether it is single vision, bifocal, trifocal, progressive, or multifocal.
Prentice's rule is a formula to calculate the amount of prism correction in a lens based on decentration and lens power. It can be used for prescribing, tolerance control, or determining unprescribed prism in eyeglasses.
A dispersive prism is an optical device that uses refraction to split white light into its spectral components (the colors of the rainbow). Learn about the principle, types, history and applications of dispersive prisms, and how they differ from diffraction gratings and mirrors.
Crown glass is a type of optical glass used in lenses and other optical components. It has low refractive index and low dispersion, and is produced from alkali-lime silicates containing potassium oxide. Borosilicate glass Schott BK7 is a common crown glass.
An extended hemispherical lens is a special type of plano-convex lens, in which the lens's curved surface is a full hemisphere and the lens is much thicker than the radius of curvature. Another extreme case of a thick convex lens is a ball lens, whose shape is completely round. When used in novelty photography it is often called a "lensball".
The Large Binocular Telescope at the Mount Graham International Observatory in Arizona uses two curved mirrors to gather light. An optical telescope is a telescope that gathers and focuses light mainly from the visible part of the electromagnetic spectrum, to create a magnified image for direct visual inspection, to make a photograph, or to collect data through electronic image sensors.
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