That the internally reflected light in the objective lens of a coronagraph is a source of scattered light has been recognized since the pioneering work of Lyot1. His solution was to block this unwanted light with an occulting spot in the image of the objective lens; this occulter is now known as ... Show moreThat the internally reflected light in the objective lens of a coronagraph is a source of scattered light has been recognized since the pioneering work of Lyot1. His solution was to block this unwanted light with an occulting spot in the image of the objective lens; this occulter is now known as the "Lyot spot". This note intends to quantify the geometry and magnitude of this internally reflected light. Show less
