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First, the team placed two concave mirrors 1 micrometre apart, and filled the lens-shaped cavity between them with a red liquid dye.
首先，实验小组放置了两面相距一微米的凹镜并向其间透镜状的中空部分填充一种红色液体染料。
We fabricated a large computer-generated holography on a concave lens surface to test the convex secondary mirrors surface.
在凹透镜表面上制作出了用于凸非球面检测的曲面全息图。
The front of ancient bronze mirrors has flat and concave surface .
古代青铜镜的镜面有平面的，也有凸面的。
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