Physics
In total internal reflection, the light travel from

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

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Physics
Absolute Zero is defined as

The temperature at which all molecular motion ceases
At which water boils at 298K
At which the volume becomes zero
At which liquid Helium boils

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