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.

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能够产生放大图像的单个凸透镜。

A single convex lens is used to produce an enlarged image.

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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.

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文中提出了两种利用放大原理测量全息光栅光栅常数的简单方法：扩束镜放大成像法和凸透镜放大成像法。

Two kind of simple methods, which are termed of extender lens amplification imaging method and convex lens amplification imaging method, are proposed based on amplification principle in this paper.

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文中提出了两种利用放大原理测量全息光栅光栅常数的简单方法：扩束镜放大成像法和凸透镜放大成像法。

Two kind of simple methods, which are termed of extender lens amplification imaging method and convex lens amplification imaging method, are proposed based on amplification principle in this paper.

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