The mirror lens objective has its negative part element provided with a concave outer face adjacent the positive part element. The condition 3.125 F fm 1.475F is satisfied for the axial focal length fm of the hollow mirror. The inherent focal lengths of the negative element and the hollow mirror have a mutual relation such that the condition 0.150 -Xo 0.768 is satisfied for the quotient Xo of the inherent focal length of the negative element divided by the focal length of the surface mirror.
展开▼
