Question: A Babinet compensator is positioned at 45 between crossed linear polarizers and is being illuminated with sodium light. When a thin sheet of mica (indices

A Babinet compensator is positioned at 45° between crossed linear polarizers and is being illuminated with sodium light. When a thin sheet of mica (indices 1.599 and 1.594) is placed on the compensator, the black bands all shift by one quarter of the space separating them. Compute the retardance of the sheet and its thickness.

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