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What is the type of waves that the ESP8266 WiFi Module detects?

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What is the type of waves that the ESP8266 WiFi Module detects?

(a) Infrared Signal

(b) Radio Signal

(c) VL Signal

(d) Hybrid Signal

The question was posed to me in a job interview.

My question comes from OV7076 Camera Module topic in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino

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Right option is (c) VL Signal

Explanation: The OV7670 Camera Module detects light wave patterns which fall in the visible spectrum, that is approximately 700 nm. This is roughly the light waves which are also visible to the naked human eye.

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