Refraction of Light –Part 2. Internal Reflection. When light travels from a slow medium to a fast medium, the angle of refraction is larger than the angle of incidence. When the angle of refraction should be 90 o or greater, there is total internal reflection.
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Diameter less than 20.5 micrometers
Randomly oriented hexagonal ice crystals
Flat faces horizontally oriented
Hexagonal ice crystals
Diameter greater than 30 micrometers