What is the limit of resolution of light microscope and that of the unaided eye?

Answer 1

We can hardly differentiate the four lines drawn within a one-milimeter-length (250 micrometer). Below this line lies the realm which is invisible to human unaided eye: 200-250 micrometer

The resolution of the light microscope cannot be smaller than the half of the wavelength of the visible light, which is 0.4-0.7 micrometer. When we use green light (0.4 micron), we can see the objects which is, at most, about 0.2 micron (200 nanometer). Below this point, light microscope is useless, because we must use a wavelength smaller than 400 micrometer. The waves that associate the electrons has smaller wavelength. Then we can use electrons, but in an electron microscope.

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Answer 2

The unaided human eye= 0.2mm whereas the microscope is 0.2 micrometers