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The refractive index of a solid is obser...

The refractive index of a solid is observed to have the same value along all direction. Comment on the nature of this solid. Would it show cleavage property?

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As the solid has same value of refractive index along all directions, this means that it is isotropic and hence amorphous. Being ans amorphous solid, it would not show a clean cleavage when cut with a knife. Instead, it would break into pieces with irregular surfaces.
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