Discussion
The RADAR, LIDAR and SONAR are examples of ....................
Answer: B
RADAR, LIDAR and SONAR are active remote sensing sensors.
An active sensor supplies its own energy: it emits a pulse of microwaves (RADAR), laser light (LIDAR) or sound (SONAR) and records the signal reflected back, measuring distance from the travel time. Because they do not depend on sunlight, they work by night and, for radar, through cloud.
Passive sensors, such as ordinary cameras and multispectral scanners, record reflected sunlight or emitted heat. PSLV and GSLV are Indian launch vehicles, not sensors.
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