Physics
For a ray of light to suffer total internal reflection it has to pass from :

Air to water
Water to glass
Air to glass
Glass to water

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Physics
An electron microscope gives higher magnification than an optical microscope, because :

The wavelength of electrons is smaller as compared to the wavelength of visible light
The velocity of electron is smaller than that of visible light
The electrons have more energy than the light particles
It uses more powerful lenses

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