SETT ATT ELEIMENERA ASTIGMATISM OCH KOMA I SPEKTROGRAFUPPSTELLNINGAR DER PLANGITTER OCH TVA SFERISKA KONKAVSPEGLAR INGAR

摘要

To eliminate astigmatism and coma in a spectrograph the distance between the entrance slot and a first concave mirror, as well as the relative angular positions of the entrance slot, the plane grating, the two concave mirrors and the focal plane are selected so as to satisfy the following conditions. +TR