Physics
The Hooke's law is valid for

Entire stress strain curve
Entire elastic region of the stress strain curve
Elastic as well as plastic region of the stress strain curve
Only proportional region of the stress strain curve

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Physics
What is a compound microscope?

A microscope that has one lens.
A microscope that has two sets of lenses : an occular lens and an eyepiece.
A microscope whose lenses are concave.
A microscope whose lenses are convex.

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