Physics
To resolve an object in an electron microscope,

The wavelength of the electrons must be close to the diameter of the object
Both A & B
None of these
The wavelength of the electrons must be greater than the diameter of the object.

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Physics
What is a compound microscope?

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

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Physics
In total internal reflection, the light travel from

Denser to rarer medium and it occurs with no loss of intensity
Rarer to denser medium and it occurs with loss of intensity
Denser to rarer medium and it occurs with loss of intensity
Rarer to denser medium and it occurs with no loss of intensity

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