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.
对双曲余弦高斯光束通过光阑透镜分离系统的轴上光强分布做了详细的数值分析。
The axial intensity distribution of Hermite-cosh-Gaussian (HChG) beams passing through a system with the aperture and lens separated is studied numerically.
根据计量光栅的特点，可以利用双光栅效应测量透镜焦距。
Based on Lau effect in double grating, the focal distance of lens is measured.
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