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What is the major principle of optical microscopy?

What is the major principle of optical microscopy?
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The major principle of the optical microscopy is that an objective lens with very short focal lenght used to form a highly magnified real image of the object.

An optical microscope creates a magnified image of an object specimen with an objective lens and magnifies the image further more with an eyepiece to allow the user to observe it by the naked eye.

Firstly an magnified inverted real image is created by objective lens and next, using the eyepiece the more enlarged erect virtual image is created

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