Coronagraph

Coronagraph

. Sunlight enters from the left, and is focused by an objective lens, L1, on an occulting disk, blocking the intense glare of the photosphere. Light from the corona, which is outside the photosphere, bypasses this occulting disk and is focused by a second lens, L2, forming an image of the corona. Other optical devices are placed along the light path to divert and remove excess light.

Copyright 2010, Professor Kenneth R. Lang, Tufts University