Physics
It is easier to carry two buckets of water in one hand each, than to carry only one in one hand because

Centre of gravity falls within the body
Weights of buckets are balanced
Centre of gravity and centre of equilibrium fall within the feet
Resultant weight of buckets is zero

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

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