Microscope imaging principle and its light path diagram

Optical microscope imaging principle and its light path diagram:

Optical microscope is based on the imaging principle of convex lens, to go through the convex lens of the two imaging. The first time first through the objective lens (convex lens 1) imaging, this time the object should be in the objective lens (convex lens 1) between the double focal length and double focal length, according to the principle of physics, into the magnification of the inverted solid image should be. The first image is then used as the "object" for the second image through the eyepiece. Since we are looking at the other side of the eyepiece, according to the principle of optics, the second image should be an imaginary image, so that the image and the object are on the same side. Therefore, the first image should be within double the focal length of the eyepiece (convex lens 2), so that after the second imaging, the second image should be a magnified orthogonal virtual image. The second image is an enlarged orthogonal virtual image, but the second image is an inverted enlarged virtual image, if you're talking about a real object.