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The Achromatic Lens

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-475

2025-12-20

635

Achromatism, or the formation of images without colored fringes, is secured by combining a plano-concave lens of flint glass with a double convex lens of crown glass. These are of such curvatures that the dispersion of one is neutralized by that of the other, while the refraction is retained. The refraction of the combination is less, however, than that of the double convex lens alone.