Fig. 2.15 (a) A birefringent optical retarderplate with linear input polarization.The optic axis of the birefringentcrystal lies in the plane of the input surface.(b) Input surface of the retarder,showing the resolution of the input polarizationinto the o- and e-rays. θ isthe angle between the input polarizationand the optic axis, and d is thethickness of the plate
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