Physics
The basic reason for the extraordinary sparkle of suitably cut diamond is that

It has a very high refractive index
It is very hard
It has a very high transparency
It has well defined cleavage planes

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Physics
The earth is a

Bad absorber and bad radiator of heat
Non-absorber of heat
Good reflector of heat
Good absorber and good radiator of heat

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Physics
What is a compound microscope?

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

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