Plano-convex or plano-concave lens with beam deflecting means attached thereto

Optical unit has a lens (1) that is designed as a Plano convex- or Plano concave lens for directing beam of rays emitted by a transmission unit towards a target object through a mirror system. A prism (6) is on a plane surface of the convex and/or concave lens, where the lens and the prism form a single component. The prism deflects the rays as a transmission beam of rays in a direction of the object. Independent claims are also included for: (A) An application of an optical unit for inward and outward reflection of transmitting and receiving beam of rays; and (B) A panfocal telescope comprising a measuring device.