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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Ankita Sahoo posted an Question
July 29, 2020 • 23:51 pm
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10 points
10 points
- IIT JAM
- Geology (GG)
Choose the correct answer
. Ohi he locing emevk (4) aare trored (A) An isotepic mineral remoalns odarek de thtougr (e) Plen ekrceism a the havge czXour oa minera Cc) Minerek ohe retelinic system arte cpticol Sed rodalen acye unodere stosseol polar olurcing reofeien tandlext crcosseo polarc eaniaxial (b) Meladepe în an meerderence maxs the omerceyen of an opie ois5.
2 Answer(s)
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Sajan sarthak
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Option A and D is the correct answer.
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can you explain that
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1.isotropic minerals don't show double refraction so light will not split any direction undercrossed Nicol and also will not pass at all to eyepiece. 2.pleochoeism is a property seen in uncrossed. 3.Triclinic biaxial. 4. optic axis emmerges from the black dot that is melatope in interference figure
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Rahul kumar Best Answer
Ans-A (Isotropic minerals remains dark through out 360 degrees under cross nicols) & D (melatope in an interference figure is the point of emergence of optic axis). Option B is incorrect because pleochroism is a phenomena seen under plane polarized light. Option C is incorrect because triclinic minerals are optically biaxial