crown glass in English

noun
1
glass made without lead or iron, originally in a circular sheet. Formerly used in windows, it is now used as optical glass of low refractive index.
The ‘Barlow lens ‘, a modification of this telescope lens, is a negative achromatic combination of flint glass and crown glass .’

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1. Newtonians explain this by saying that the achromatic refractor's crown glass and flint glass refract light as a whole with equal intensity but disperse individual colors differently.

2. Aplanat: A system of lenses invented by Adolph Steinheil, in 1866, for use in photography, consisting of a biconvex crown-glass lens placed between two concavo-convex lenses of flint-glass.

3. The Achromatic lens consists of a double convex lens of crown glass combined with a plano-concave lens of flint glass. PHYSICS WILLIS EUGENE TOWER Achromatic lenses are used in all high-grade optical instruments such as telescopes and …