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Question

Which of the following is not an anisotropic?

A
zinc blend
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B
quartz
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C
sapphire
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D
iron oxide
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E
apatite
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Solution

The correct option is A zinc blend
Anisotropy is the property of being directionally dependent, which implies different properties in different directions.
Zinc blend (ZnS) is the only isotropic material in the list.
Quartz crystals and Saphire are birefringent, so they exhibit optical anisotropy.

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