Physics
In a diesel engine the high temperature needed to ignite the fuel is achieved by

An electrical spark
Compressing air in the cylinders
The battery
Using heat from exhaust

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

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