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Modern lenses that are highly corrected for optical aberrations generally have multiple individual lenses or lens elements which are mechanically held together in a barrel or lens tube and are more properly referred to as a lens or optical system. Each air-glass interface in such a system if not coated to reduce reflections can reflect ...
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In hot and humid climates it is common for fungus to grow on the surfaces of optical components. Airborne fungal spores settle on optical surfaces and develop into organisms that digest organic material such as oils from fingerprints or lens coatings producing hydrofluoric acid as a waste product.
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Depending on the combination of these properties optical glasses are subdivided into crown glass (low refraction and high dispersion) and flint glass (with the opposite properties). Optical glass is used to manufacture optical instruments and devices such as eyeglasses objectives microscopes binoculars and photometers.
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A lens however has an advantage over a mirror in that it permits the observer to be on the opposite side from the incoming light. [p. 64] Simple Positive Lenses (also known as converging lenses) are single pieces of glass that are thicker at their centers than at their edges. Each surface is a section of a sphere and a line though the two ...
Get PriceThe Refraction of Light: Lenses and Optical Instruments
Total internal reflection at a glass-air interface. Since n = 1.5 for glass at a glass-air interface the critical angle is 2 This can be used to turn a ray of light through an angle of 90o or 180o with total internal reflection using a prism of glass and keeping θ 1 = 45o! useful in the design of optical instruments.
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