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July 2,2009

[Note] achromatic, apochromat

After:


Before:


"A concave lens of flint glass is commonly combined with a convex lens of crown glass to produce an achromatic doublet"

by John Dollond

Crown glass: low refractive index (≒1.52), low dispersion (with Abbe numbers around 60)
Flint glass: high refractive index (1.45-2.00), low dispersion (with Abbe numbers around 50-55)

More details:CLN, No.12/2000


Posted by cittajazz at 樂多Roodo!│ 5:32 │ 回應(0) │ 引用(0)
標籤： lens,optics, note, apochromat
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