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
Why two thin shirts can keep us warmer than a single thick shirt in winter ?

No radiation of heat takes place
Air layer between two shirts works as good conductor
Two thin shirts become thicker so prevent transmission of heat
Air layer between two shirts behaves like insulating media

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