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B
Electromagnetic theory.
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C
Refraction of light.
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D
Magnification of glass lenses.
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Solution
The correct option is B Electromagnetic theory.
The electron microscope is based on the principle of electromagnetic theory. The electron microscope uses electrostatic and electromagnetic lenses to control the electron beam and focus it on forming an image. These electron optical lenses are analogous to the glass lenses of a light optical microscope.