Physics
In which one of the following the phenomenon of total internal reflection of light is used ?

Working of binoculars
Formation of mirage
Formation of rainbow
Twinkling of stars

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Physics
To resolve an object in an electron microscope,

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

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