Physics
The magnifying power of an astronomical telescope can be decreased by

Increasing the focal length of the objective
Increasing the focal length of the eyepiece
None of these
Decreasing the focal length of the eyepiece

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Physics
What is a compound microscope?

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

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