A prism optical system has an optical element that includes an entrance-side reflecting surface having reflection on the most entrance-side of the optical element on an optical path, an exit-side reflecting surface having reflection on the most exit side of the optical element on the optical path, and an intermediate reflecting surface having reflection between the entrance-side reflecting surface and the exit-side reflecting surface on the optical path,a thickness of an intermediate area including the intermediate reflecting surface in the X-Z plane is greater than a thickness of an entrance-side area including the entrance-side reflecting surface or a thickness of an exit-side area including the exit-side reflecting surface, andthe following condition (1) is satisfied:; 0.5Tn/Tc1.0 (1);where Tn is a thickness of the entrance-side area including the entrance-side reflecting surface, and Tc is a thickness of the intermediate area including the intermediate reflecting surface.
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机译：棱镜光学系统具有光学元件，该光学元件包括在光路上在光学元件的最入射侧具有反射的入射侧反射面，在光学元件的最射出侧具有反射的出射侧反射面。在光路上，以及在光路上的入射侧反射面和出射侧反射面之间具有反射的中间反射面，在XZ平面中包括中间反射表面的中间区域的厚度大于包括入口侧面反射表面的入口侧区域的厚度或包括透镜侧面的出射侧区域的厚度。出射侧反射面，并且满足满足以下条件（1）： ; <？in-line-formulae description =“在线表达式” end =“ lead”？> 0.5 I> Tn / Tc <1.0（1）<？in-line-formulae description =“ In -线式“ end ＝ tail”→＞;其中，Tn是包括入射侧反射面的入射侧区域的厚度，Tc是包括中间反射面的中间区域的厚度。
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