Physics
A photostat machine works on

Thermal image making
Magnetic image making
Electromagnetic image making
Electrostatic image making

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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
Rarer to denser medium and it occurs with 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

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