Just as a double convex lens enlarges so a double concave lens reduces.
正象双凸透镜可以放大那样，双凹透镜也可以缩小。
Just AS a double convex lens enlarges, so a double concave lens reduces.
正象双凸透镜可以放大那样，双凹透镜也可以缩小。
The base has special concave design, and can be fixed with double-sided tape.
底板有特殊凹位设计，可以直接用双面胶固定。
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