After popularizing perfect angle, what should the left eye see after fixing the slide specimen on the stage and minimizing the system?

In the use of the microscope, there are several parts that the eyes observe: when aiming at the light, the eyes look at the eyepiece and turn the reflector by hand until a bright field of vision is seen in the eyepiece; When observing the slide specimen with a microscope, when rotating the coarse focusing screw to lower the lens barrel, in order to avoid damaging the slide, the eyes should be kept on the objective lens; Minimize the lens barrel, turn it to the coarse focusing screw in the opposite direction, and look at the eyepiece to find the object image when lifting the lens barrel; After finding the object and adjusting it to be clear, open your eyes, observe with your left eye and draw with your right eye. Therefore, when observing the slide specimen with a microscope, when rotating the coarse focusing screw to lower the lens barrel, the eyes must look at the objective lens to avoid damaging the slide.

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