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I'm confused by this paragraph:

In January 1901, in simple wooden huts, Marconi received a transmission from the Isle of Wight over 180 miles distant, thus proving that radio would work over the horizon; something that many scientists thought impossible.

Extracted from this page.

How would light reach the antenna?

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The radio waves were reflected from a layer in the atmosphere called the ionosphere.

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Well, to be swift, I suggest you read up about something called Space Wave Propagation.

The idea behind it is fairly simple. Since the Ionosphere is filled with charged particles or 'ions', it should essentially act like a 'conductor' and reflect the electromagnetic radiation incident on it. That is what happens in this case too.

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