Physics
A cup of hot coffee is placed on a metal table in a room. By which of the following methods does it lose heat?

Conduction and convection only
Conduction, convection and radiation
Convection and radiation only
Conduction and radiation only

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Physics
In total internal reflection, the light travel from

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