The light microscope, the basic elements and getting it in focus.




The image to the right details the basic components of the light microscope. Getting both oculars in focus is not as straightforward as you might think. The reason is that for most of us both eyes do not have exactly the same acuity. Here's what to do to get both oculars in focus: Put a slide on the stage. Adjust the distance between the oculars so you see the image as a circle. Close your left eye and use the coarse and fine focus knobs to bring the image into sharp focus. Now close your right eye and open your left and twist the ring on the adjustable, left, ocular to focus the image. Don't touch the coarse or fine focus knobs. Now both eyes should be seeing the image in focus, and it will stay that way as you change objectives and slides.
Summing it up.




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