Physics
The recoiling of gun is an example of which of the following?

Law of Conservation of Linear Momentum
Law of Conservation of Energy
Conversion of Kinetic Energy to Potential Energy
Law of Conservation of Angular Momentum

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Physics
What is a compound microscope?

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

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