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Terms for subject Optics branch of physics containing 双X | all forms
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从柯林斯积分公式出发，研究了高斯光束通过双焦透镜后的聚焦特性Starting from Collins integral formula, the focusing characteristics of Gaussian beams passing through a bifocal lens are studied
双光眼镜，双焦距透镜bifocal lens

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