Three-inclined mirror type system for astronomical mirror telescope

摘要

The rotation of the first mirror so chosen that the second mirror lies outside of the impinging beam. After light reflection at the third mirror a seal object image is provided without the need for a real intermediate image. The second mirror is pref. fitted in the vicinity of the third mirror such that the ratio of spacings between the first to the second mirror exceeds 2 than that between the second to the third mirrors. The angle of the optical axes between the impinging beam, before and after the reflection at the primary mirror, is smaller than 80 deg.