Bacteria are smallest primitive, simple, unicellular, prokaryotic and microscopic organisms. But these organisms cannot be studied with naked eyes because of their minute structure. Therefore in search for the information about the structure and composition of bacterial cells, cell biologist used light microscopes with a numerical aperture of 1.4 and using wavelength of 0.4 μm separation. But there are still certain cellular structures that cannot be seen through naked eyes, and for them electron microscope is used. There are certain improved types of light microscope which can be incorporated to improve their resolving power. Hence microscopy is playing a crucial role in the field of bacteriology.
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