| 摘要 |
Provided are an optical element in which a thickness of a refractive optical portion having an extraordinary partial dispersion characteristic is suitably specified to minimize flare generated by a diffraction optical portion, to thereby sufficiently correct chromatic aberrations to obtain excellent optical performance, and an optical system including the optical element. The optical system includes a cemented portion in which the refractive optical portion made of a solid material and has a refractive action is brought into intimate contact with at least one of light incident and exiting surfaces of the diffraction optical portion having a plurality of diffraction gratings which are layered. An Abbe (&ngr;d), a partial dispersion ratio (&thetas;gF), and an extraordinary partial dispersion ratio (&Dgr;&thetas;gF) of the solid material are suitably set.
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