| 摘要 |
An immersion microscope objective includes, in order from the object side, a first lens group having positive refractive power for converting the luminous flux from an object into convergent luminous flux, a second lens group having the refractive power lower than that of the first lens group, and a third lens group, and satisfies the following conditional expression where NA indicates the numerical aperture on the object side, and d0 indicates a working distance. 3 mm<NA×d0<8 mm |
