Physics
In total internal reflection, the light travel from

Rarer to denser medium and it occurs with no loss of intensity
Denser to rarer medium and it occurs with no loss of intensity
Rarer to denser medium and it occurs with loss of intensity
Denser to rarer medium and it occurs with loss of intensity

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Physics
Inside an aeroplane, flying at a high altitude,

the pressure inside is less than the pressure outside.
the pressure is the same as that outside.
normal humidity and partial vacuum are maintained.
normal atmospheric pressure is maintained by the use of air pumps.

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