防盗门上的猫眼是什么原理?

2026-03-03 网络整理佚名1620

Key Point:猫眼，又称门镜，是装在住宅户门上的一种小型光学仪器，便于居民观察户外情况。已成为居家安全的必需品。它是有一块凹透镜（物镜）和一块凸透镜组成。物镜的焦距

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