Physics
Kepler's law of planetary motion states that the square of the time period is proportional to the

Square of the semi-major axis
Cube of the semi-major axis
Fourth power of the semi-major axis
Semi-major axis

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Physics
What is a compound microscope?

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

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