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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Gurmeet Singh posted an Question
December 15, 2020 • 00:19 am
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30 points
30 points
- IIT JAM
- Geology (GG)
Sir according to me ans should be a but given d
Extinction angle is the angle between The light position and the dark position of a mineral The zero of the circular scale and the dark position The vibration direction of the lower and the upper nicols A vibration plane and a crystallographic direction in a mineral section
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Saurabh 1 Best Answer
Correct answer is D. Extinction angle is generally an angle between the cleavage plane or crystal face (im short Crystallographic direction) and a vibration direction. Where 0° corresponds to parallel extinction , 45° to the symmetrical extinction and rest to the inclined (oblique) extinction. Here I'm attaching a figure so that you can get an idea about various types of extinction. Note: For more idea about extinction, go through the optical mineralogybook by Paul F Kerr, very simple and easy to understand(this figure is from that book only).
![cropped3448877345520537618.jpg]()
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Sajan sarthak![best-answer]()
No the Answer should be D.