Physics
Pressure Cooker cooks faster because

The material of the cooker is a good conductor
Boiling point decreases with rise of pressure
Higher temperature is attained for cooking
It cooks the food at low pressure

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Physics
In total internal reflection, the light travel from

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

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