Question

device used to see overhead a crowd.​

Answer 1

Answer:

A periscope is the device used to see overhead a crowd. It consists of 2 mirrors place at an angle of 45 degrees each. It works on the principle of reflection.

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Answer 2

Answer:

A people counter is an electronic device that is used to measure the number of people traversing a certain passage or entrance. Examples include simple manual clickers, infrared beams, thermal imaging systems, WiFi trackers and video counters using advanced machine learning algorithms.

Explanation:

i thin one of the comman didvce is drown