EARTH SCIENCE
MINERALOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The distance that happens when one wave lags behind another one is called ____
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retardation
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befrings
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double refraction
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None of the above
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Explanation:
Detailed explanation-1: -In crystal optics, the amount by which the slow wave falls behind the fast wave during passage through an anisotropic crystal plate.
Detailed explanation-2: -Birefringence is a measure of the differential RI. Therefore the greater the BIREFRINGENCE of a mineral, the greater the RETARDATION. The further light must travel through an anisotropic grain the more the slow ray will lag behind. Thus the greater the THICKNESS of the sample, the greater the RETARDATION.
Detailed explanation-3: -Birefringence can be determined as it is the difference in the optical path (OPD) between the O-and E-rays, also known as the retardation, divided by the thickness t of the polymer part.
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