Physics
What is a compound microscope?

A microscope that has one lens.
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.

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Physics
RADAR is used for:

locating geostationary satellites.
receiving a signals in a radio receiver.
locating submerged submarines.
detecting and locating the position of objects such as Aeroplanes.

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