Physics
What is the direction of torque?

Parallel to the radius
Opposite to the direction of applied force
Perpendicular to the direction of applied force
Same as the direction of applied force

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Physics
In total internal reflection, the light travel from

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

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