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Optical element and achromatic lens

Image Number 4 for United States Patent #7700714.

There are provided an optical element that comprises a polymer which has a structural unit derived from a specific dihydroxy compound typified by 2,2-bis(4-hydroxyphenyl)-1,1,1,3,3,3-hexafluoro propane (bisphenol AF) and in which the relationship between a refractive index n.sub.D and an Abbe number .nu..sub.D satisfies the following formula (I): (I) and that is used for correction of chromatic aberration, and an achromatic lens using the optical element.

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