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A calcite crystal is placed over a dot on a paper sheet and the crystal is rotate(d) On viewing through the calcite or sees,
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one dot rotating about the other stationary dot sometimes coinciding with it
When a calcite crystal is placed over a dot on a piece of paper, one will observe two dots from above. If the crystal is rotated, then the dot produced by emergent ray will rotate around the siationary dot, which sometimes coincide with it.
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