LIDAR (Light Detection and Ranging) is a technology that utilizes the LASERs to determine the distance to an object by throwing the LASER light on it. The basic concept behind its working is quite similar to RADAR except that the later uses radio waves instead of laser pulses. Both count distance by calculating the time between transmission and reception of the pulses.
As LIDAR uses shorter wavelengths for its operation, therefore it calculates the more accurate measurement for even smaller objects.
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