Physics
The oil in the wick of lamp rises due to

Force of cohesion
Low viscosity of oil
Pheonomenon of capillarity
Pressure difference

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Physics
In total internal reflection, the light travel from

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

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