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of around 2, while water has a much smaller refractive index of approximately 1.33. This means that the water droplets focus the light about 20% to 50% of the diameter beyond the rear surface of the droplet. When dew droplets are suspended on
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at approximately this distance away from the surface of a plant, the combination of droplet and plant acts as a retroreflector. Any retroreflective surface is brightest around the
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or reflects off that surface, the same lens re-focuses that light into the direction from which it came. This configuration is similar to a
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in which a bright spot appears around the shadow of the viewer's head in the presence of
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in water vapour are similar effects caused by different mechanisms.
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to focus the light onto the surface behind them. When this light
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325:Perseus with the Head of Medusa
343:Portraits of Benvenuto Cellini
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436:Atmospheric optical phenomena
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381:The Magnificent Adventurer
258:What causes heiligenschein
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373:The Firebrand of Florence
37:Halo (optical phenomenon)
128:cat's eye retroreflector
54:[ˈhaɪlɪɡn̩ˌʃaɪn]
365:The Affairs of Cellini
309:Nymph of Fontainebleau
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317:Cellini Salt Cellar
236:Atmospheric Optics
185:Subparhelic circle
89:optical phenomenon
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349:Benvenuto Cellini
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232:"Heiligenschein"
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400:(2001 play)
392:(1990 film)
384:(1963 film)
368:(1934 film)
328:(1545–1554)
190:Sylvanshine
174:Gegenschein
29:Oxfordshire
336:Portrayals
301:Sculptures
196:References
35:See also:
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312:(c. 1543)
137:trichomes
430:Category
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124:scatters
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397:Cellini
357:Ascanio
216:8 March
105:hotspot
81:aureola
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320:(1543)
120:lenses
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