The diameter of a thin wire was obtained by measuring the shadow in the Fresnel diffraction zone.

通过细丝后在其后菲涅耳衍射区留下阴影，测量阴影宽度可得细丝直径；

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The diameter of a thin wire was obtained by measuring the shadow in the Fresnel diffraction zone.

通过细丝后在其后菲涅耳衍射区留下阴影，测量阴影宽度可得细丝直径；

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