Physics
Suppose voltage V is applied across a resistance R. The power dissipated in the resistance is P. Now the same voltage V is applied across a parallel combination of three equal resistors each of resistance R. Then the power dissipated in the second case will be

2p/ 3
3P
P/3
P

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Physics
In total internal reflection, the light travel from

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

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