In order to ensure the large focal length (telescopic regime survey), the optical system, built according to the principle of the multiple internal reflection (see figure) is used.
为了确保大焦距(伸缩制度的调查)，光学系统，内置根据对等原则的多重反射(见图)是使用。
The multiple reflection within the circular disc provides a design feature to reduce the influence of non-total internal reflection and significantly improves the measurement linearity.
光线在圆盘内的多次反射显著地消除了非全内反射的影响，有效地改善了测量线性度。
The multiple reflection within the circular disc provides a design feature to reduce the influence of non-total internal reflection and significantly improves the measurement linearity.
光线在圆盘内的多次反射显著地消除了非全内反射的影响，有效地改善了测量线性度。
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