| 摘要 |
An immersion microscope objective lens comprises a first lens group G1 having a positive refracting power, a second lens group G2 having a positive refracting power and a third lens group G3 having a negative refracting power in the order from the object side. The first lens group G1 has a first cemented lens consisting of a plano-convex lens with the flat surface facing the object side and a meniscus lens with the convex lens facing the image side cemented together, a positive lens with the surface having a greater refractive power facing the image side, and a second cemented lens consisting of a negative lens and a positive lens cemented together, in the order from the object side. The second lens group G2 has a cemented lens consisting of a negative lens and a positive lens cemented together. The refractive index n12 of the meniscus lens in the first lens group G1 with respect to the d-line satisfies the following condition: <paragraph lvl="0"><in-line-formula>n12>1.9. </in-line-formula>
|
