What kind of impedance does a half wavelength transmission line present to the source when the line is shorted at the far end?

A half-wavelength transmission line has the special property of repeating the load impedance exactly at the source. This means the generator or transmitter will see the exact same impedance condition that exists at the far end of the cable. Since the far end of this line is shorted, it presents a very low (effectively zero) impedance. The half-wave line repeats this short circuit back to the source, resulting in a very low impedance being presented. Distractors claiming a high impedance are incorrect because that would only happen if the line inverted the impedance (like a quarter-wave line) or if the far end was an open circuit.