Physics
A mirage occurs because of

Total internal reflection by layers of air
Diffraction of light
Interference of light
Reflection by hot ground

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Physics
Solids have definite shapes.This is because

The forces of adhesion are large
The forces of cohesion are very large
The forces of cohesion of the molecules within are very much less in them
The forces of adhesion are less

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Physics
What is a compound microscope?

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

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