How an optical microscope uses light to see
The illumination method of optical microscope can use natural light or a separate light source. Generally, in order to obtain better resolution, the shorter the wavelength, the better the resolving power. Professional microscopes mostly use purple light with short wavelength for illumination, so the medical pictures in the news Objects under the microscope are mostly purple.
From the working principle, the optical microscope can be regarded as a magnifying glass with a complex structure. It is composed of an objective lens and an eyepiece. The object is placed on a glass slide. The image is enlarged twice through the eyepiece (equivalent to observing a magnified photo through the eyepiece), the eyepiece can be magnified by 5 times to 15 times, and the magnification of the microscope is calculated by multiplying the magnification of the objective lens by the magnification of the eyepiece, so The magnification of optical microscope is generally 20 times to 1500 times.
