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Q.

A calcite crystal placed over an ink dot is rotated. On seeing through the crystal one finds

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a

Two dots moving along parallel straight lines

b

both dots rotating about a common axis

c

One dot rotating about the other

d

Two stationary dots

answer is C.

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Detailed Solution

When a calcite crystal is placed over a dot on a piece of paper and rotated one dot appears to rotate about the other. This optical property is called birefringence. This causes objects viewed through a clear piece of calcite to appear doubled. 

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A calcite crystal placed over an ink dot is rotated. On seeing through the crystal one finds