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Engineering Physics by S. Mani Naidu

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14.19 Quater-wave plate

A quater-wave images plate is a thin double refracting crystal of calcite or quartz, cut and polished parallel to its optic axis to a thickness ‘d’ such that it produces a path difference of images or phase difference of images between the o-ray and e-ray when plane polarized light incident normally on the surface and passes through the plate.

As shown in Fig. 14.31, consider a calcite crystal of thickness ‘d’. The optic axis is parallel to the ...

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