凹镜是一种光学仪器。
他的样子在凹镜里显得非常可笑。
总的来说，所有微小的空中冰晶的面孔扮作一块巨大的凹镜。
Collectively, the faces of all the tiny airborne ice crystals act as a giant concave mirror.
观察目镜由凹镜和分隔栅组成，在目镜中可同时看到二个半圆色，其左边的为试样颜色。
Observation eyepiece consists of concave mirror and a separate gate is formed, in the eyepiece can be seen at the same time the two semicircle color, its left for the sample color.
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