OPTICS TELESCOPE EQUIPMENT & TECHNIQUES A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site prime focus The point in a telescope at which the reflected rays from the primary mirror or the transmitted rays from the objective lens come to a focus. Related categories    • OPTICS AND OPTICAL PHENOMENA    • TELESCOPE EQUIPMENT AND TECHNIQUES Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP