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A Famous Time It Happened
The one and only time this happened was in northern Ohio. The light bended in a way that in Cleveland you could see the Canadian border. There are a ton of times normal refraction happens but this was the only time refraction this severe happened.
Sound waves and light waves change speed when they pass across the boundary between two substances with different densities. Air and glass are the substances that usually cause why light could bend like that.
http://meteorologytraining.tpub.com/14271/css/14271_65.htm
www.bcccc.co.uk/schools/gcsebitesize/science/aqa/waves/generalwavesrev5.shtml
https://www.sciencelearn.org.nz/resources/49-refraction-of-light