| 摘要 |
A lens system for a microscope having a variable angle lens-barrel. The lens-barrel includes an afocal optical system lying along an optical path extending from an infinite correction type objective lens to an ocular lens and comprises a first lens group which has positive refractive power, a second lens group which has negative refractive power, and a third lens group which has positive refractive power. The lens system includes a reflective mirror positioned between the second lens group and the third lens group which is mounted for rotation a out a pendular axis. Light through the infinite correction type objective lens becomes a parallel light beam which is passed to the third lens group from the reflective mirror.
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