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Which of the following is a passive remote sensing system

This question belongs to Geological Engineering Remote Sensing And GIS In Geological Engineering
Remote Sensing and GIS in Geological Engineering
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Which of the following is a passive remote sensing system?

Answer & Solution
Correct Answer: Option C
Optical satellite sensors are passive as they rely on sunlight reflected from the Earth.Radar and LiDAR are active systems because they emit their own signals.
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