Physics
What is the direction of torque?

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

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Physics
Holography is a technique of

Recording a permanent three dimensional multicolour photograph
Recording a permanent three dimensional photograph of a given single colour or a multicolour
Recording a permanent three dimensional black and white photograph
Recording a permanent, sharp two diimensional black and white or multicolour photograph

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