Question

A calcite crystal is placed over a dot on a piece of paper and rotated. On seeing through the calcite, one will see :

• A. One dot
• B. Two stationary dots
• C. Two rotating dots
• D. One dot rotating about the other

Answer 1

The correct option is D One dot rotating about the other

calcite crystal display an optical property called birefringence. This causes objects viewed through a clear piece of calcite to appear doubled.
This is the reason one will see one dot rotating about the other.