Polarised LM of a thin sheet of ice

Polarised LM of a thin sheet of ice

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Credit: ADRIENNE HART-DAVIS/SCIENCE PHOTO LIBRARY

Caption: Ice crystals. Polarised light micrograph of a thin sheet of ice. The ice appears to have many colours within it. These are birefringence patterns due to different wavelengths of plane polarised light being rotated by different amounts. These colours indicate strong internal tensions in the ice, a result of the outer layers of ice freezing before the inner regions and therefore introducing stress into the crystal structure. Magnification: unknown.

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Keywords: birefringence pattern, climate, cold, crystal, frozen, ice, ice crystal, light micrograph, meteorology, photopolarimetry, polar. lm, stress pattern, weather, winter

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