Physics
For a ray of light to suffer total internal reflection it has to pass from :

Air to water
Water to glass
Glass to water
Air to glass

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Physics
Air moves from the region where the air ________

Humidity is high to the region where the humidity is low
Pressure is high to the region where the pressure is low
Pressure is low to the region where the pressure is high
Humidity is low to the region where the humidity is high

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