Review | Constants A crystal of calcite serves as a quarter-wave plate; it converts linearly polarized light to circularly polarized light if the numbers of wavelengths within the crystal differ by one-fourth for the two polarization components. The refractive indexes for the two perpendicular polarization directions in calcite are n = 1.658 and 1.486. For light with wavelength 589 nm in air, what is the minimum thickness of a quarter-wave plate made of calcite? Express your answer with the appropriate units. H ? d = Value Units Submit Request Answer