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infrared light. that's actually the proximity sensor. Since he was making a phone call the proximity sensor turned on. Infrared light cant be seen by the human eye, but it can be seen by camera lenses.
 
infrared light. that's actually the proximity sensor. Since he was making a phone call the proximity sensor turned on. Infrared light cant be seen by the human eye, but it can be seen by camera lenses.

Aaah. cheers.
 
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