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Oum thick section of zirc cular to the stage. For ea he appearance of the grai

Oum thick section of zirc cular to the stage. For ea he appearance of the grai

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pls solve both problem with in 15 min. I will give multiple upvote.
5) Calculate the retardation of a 30 µm thick section of zircon oriented a) with its c-axis parallel to the stage, and b) with its c-axis perpendicular to the stage. For each orientation give a Miller index for a crystal face parallel to the stage, and the appearance of the grain under crossed-polars. Use the lower end of the range of refractive indices given by Nesse. 6) Calcite cleavage rhombs lying on a cleavage plane have n; = 1.566. Calculate the thickness of a cleavage fragment that gives a 3° red interference color.
Transcribed Image Text:5) Calculate the retardation of a 30 µm thick section of zircon oriented a) with its c-axis parallel to the stage, and b) with its c-axis perpendicular to the stage. For each orientation give a Miller index for a crystal face parallel to the stage, and the appearance of the grain under crossed-polars. Use the lower end of the range of refractive indices given by Nesse. 6) Calcite cleavage rhombs lying on a cleavage plane have n; = 1.566. Calculate the thickness of a cleavage fragment that gives a 3° red interference color.
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