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n REFLECTION OF LIGHT
ra a RINGS OF LIGHT SEEN THROUGH THE BRANCHES OF A TREE
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after-image altitude angle appear atmosphere axis background becomes blue sky bluish bright caused circumscribed halo cirrus clouds clouds colour contrast corona cosmic dust crepuscular rays curvature curve dark darker deviation diameter diffraction direction disc distance drops of water dust earth edge explained front gaze glass glow green ray grey Haidinger's brush height Heiligenschein horizon illuminated incident intensity iridescent lamp landscape layer less look minutes of arc mirage mist mock suns moon move nicol night notice objects observed optical orange pane particles patch of light phenomenon plane Plate polarisation purple light rainbow rays of light reflected refraction retina ring ripples round scattering scintillation seems seen shadow shadow bands shape shining shows side small halo source of light stars sun's sunset surface Theory of Colours tint trees vertical violet visible waves window yards yellow zenith zodiacal light