Physics
The electrical domestic tube light gives white fluorescent light because of

Heavy current
Colision between molecules of filled gas under electric current
Vacuum inside the tube
Falling of ultra violet rays on the white inner coating of the tube

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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 that has one lens.
A microscope whose lenses are convex.
A microscope whose lenses are concave.

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