Physics
What changes will happen to a bowl of ice and water kept at exactly zero degree Celsius ?

No change will happen
Only some ice will melt
All water will become ice
All ice will melt

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Physics
In total internal reflection, the light travel from

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

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