What is basic principle of rader?

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The basic principles of RADAR are . . .

-- When radio waves encounter any change in the physical properties of the
medium through which they're moving, some of their energy is reflected from
the boundary.

-- The part of the energy that reflects back in the direction from which it came
can be detected at the location of the source, after a period of time that's directly
proportional to the distance between the source and the reflection point.
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