Like its Cousins radar and sonar, lidar (light detection and ranging), works by broadcasting electromagnetic waves towards a target and then building up a picture from the reflection.
与雷达和声纳技术相似，激光雷达(光探测和测距)的工作原理是通过向目标发射电磁波然后根据反射波构建图像。
Our eyes can only feel the light waves (electromagnetic wave) with wavelengths ranging from 4000 to 7000a, which we call visible light.
人的眼睛只能感受波长范围在4000 - 7000埃的光(电磁)波-我们称为可见光。
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