Physics
Analog synthesis refers to a technology based on

Representing data in terms of measurable physical quantities.
Placing brief digital recordings of live sounds under the control of a synthesizer keyboard.
Interfacing synthesizer equipment.
Representing physical quantities as numbers.

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Physics
What is a compound microscope?

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

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