Physics
What is a compound microscope?

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

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Physics
Solar eclipse will take place when

the moon does not lie on the line joining the sun and the earth
the earth is between the moon and the sun
the sun is between the moon and the earth
the moon is between the sun and the earth

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