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16 Cards in this Set
- Front
- Back
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reflection
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surface turns back a portion of the light that strikes it
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scattering
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light is deflected into different directions
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crepuscular rays
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alternating light and dark bands of light that appear to fan out from the sun's position, usually at twilight
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refraction
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bending of light as it passes from one medium to another
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scintillation
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apparent twinkling of a star due to its light passing thru regions of differing air densities in the atmosphere
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twilight
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the time at the beginning of the day immediately before sunrise and at the end of the day after sunset when the sky remains illuminated
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green flash
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small green color that occasionally appears on the upper part of the sun as it rises or sets
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mirage
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refraction phenomenon that makes an object appear to be displaced from its true position
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halo
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rings or arcs that encircle the sun or moon when seen through an ice crystal cloud or a sky filled with falling ice crystals, produced by refraction
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tangent arc
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arc of light tangent to a halo, forms by refraction of light through ice crystals
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dispersion (of light)
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separation of white light into its different component wavelengths
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sundog or parhelia
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colored luminous spot produced by refraction of light through ice crystals that appear on either side of the sun (2 names)
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sun pillar
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vertical streak of light extending above (or below) the sun, produced by reflection of sunlight off ice crystals
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corona
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series of colored rings concentrically surrounding the disk of the sun or the moon, caused by diffraction of light around small water droplets of uniform size
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diffraction
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bending of light around objects producing fringes of light and dark or colored bands
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iridescence
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brilliant spots or borders of colors, most often red or green, observed in clouds up to about 30 degrees from the sun
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