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Chromatic Aberration

Chromatic Aberration. Chromatic Aberration.

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Chromatic Aberration

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  1. Chromatic Aberration

  2. Chromatic Aberration As in a raindrop or a prism, different wave-lengths of light are refracted at different angles (higher frequency ↔ greater bending). The light passing through a lens is slightly dispersed, so objects viewed through lenses will be ringed with color. This is known as chromatic aberration and it will always be present when a single lens is used. Chromatic Aberration Achromatic Lens Examples

  3. Chromatic aberration can be greatly reduced when a convex lens is combined with a concave lens with a different index of refraction. The dispersion caused by the convex lens will be almost canceled by the dispersion caused by the concave lens. Lenses such as this are called achromatic lenses and are used in all precision optical instruments.

  4. Doublet for Chromatic Aberration • The use of a strong positive lens made from a low dispersion glass like crown glass coupled with a weaker high dispersion glass like flint glass can correct the chromatic aberration for two colors, e.g., red and blue. • Such doublets are often cemented together (called achromat doublets) and may be used in compound lenses such as the orthoscopic doublet.

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