Physics
One should not connect a number of electrical appliances to the same power socket because

this can damage the appliances due to overloading
the appliance will not get full voltage
this can damage the electrical meter
this can damage the domestic wiring due to overloading

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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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