Page "Radar" Paragraph 30
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Wikipedia
Short radio waves reflect from curves and corners in a way similar to glint from a rounded piece of glass.
They are commonly used as radar reflectors to make otherwise difficult-to-detect objects easier to detect.
Corner reflectors on boats, for example, make them more detectable to avoid collision or during a rescue.
For similar reasons, objects intended to avoid detection will not have inside corners or surfaces and edges perpendicular to likely detection directions, which leads to " odd " looking stealth aircraft.
These precautions do not completely eliminate reflection because of diffraction, especially at longer wavelengths.
Half wavelength long wires or strips of conducting material, such as chaff, are very reflective but do not direct the scattered energy back toward the source.
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