Physics
A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the bucket. The reading of the spring balance

Will increase
Does not change
Varies with the increase of depth of the immersion of the iron piece
Will decrease

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Physics
What is a compound microscope?

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

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