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
Which one of the following statements with regard to Jet stream, an upper level tropospheric wave, is not correct?

Jet streams are typically continuous over long distances.
In summer, the polar front jet achieves its maximum force.
It is narrow band of high-velocity wind.
It follows the wave path near the tropopause at elevations of 8 km to 15 km.

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