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## 1.Overview
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In some special cases, the light source of the polariscope can not be placed on the back of the granular sample. For example, when air table is used to float the particles or the driving motors of the base are placed beneath the sample. Reflective photoelasticity is utilized here using the reflective polariscope. (fig) The major difference of the polariscope comparing to that used in the transmission polariscope is that the polarization of the polarizer covering the light source and the analyzer covering the camera lens are the same.
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## 2.Theory [1]
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In this section we show why the polarization of the circular light changes when it is reflected by a mirror.
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### 2.1. Reflection of polarized light on a insulator-conductor surface
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In a conductor, the solution of Maxwell equation gives electromagnetic waves with complex wave numbers. Without lost of generality we consider a specific solution correspond to frequency $`\omega`$.
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