Physics
The light rays used for eliminating bacteria

Ultra-violet radiation
Microwave radiation
X-rays
Infrared rays

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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
Rarer to denser medium and it occurs with loss of intensity
Denser to rarer medium and it occurs with loss of intensity

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