An optical system in which a maximum value of a height from an optical axis of a paraxial marginal ray closer to an expanded side than a point of intersection between an optical axis and a paraxial chief ray, includes a lens unit Lr including at least one refractive optical element Gn of a negative refractive power. In the optical system, .nu.d (Gn) as an Abbe number of a material of the refractive optical element Gn, .theta.gF (Gn) as a partial dispersion ratio regarding g and F-lines, FGn as a focal lengths of the refractive optical element Gn, and Fr as focal lengths of the lens unit Lr are set appropriately.

 
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< Color filter substrate, electrophoretic display device having the same, and method thereof

> Optical system and optical apparatus having the same

> Implantable stimulator

~ 00563