BE CAREFUL

ONCE THE SLIDE IS IN FOCUS, IT MAY BE MOVED AROUND ON THE STAGE. AS LONG AS THE DISTANCE MOVED IS NOT TOO LARGE, THE OIL DROPLET WILL REMAIN BETWEEN THE 100X OBJECTIVE AND THE SLIDE. YOU WILL NOTICE THAT WHEN THE SLIDE IS MOVED, IT WILL BE NECESSARY TO RE FOCUS THE 100X OBJECTIVE USING THE FINE FOCUS CONTROL. AT VERY HIGH MAGNIFICATIONS, VERY SMALL CHANGES IN THE DISTANCE BETWEEN THE SLIDE AND THE OBJECTIVE WILL CAUSE THE IMAGE TO GO OUT OF FOCUS. IRREGULARITIES ON THE SLIDE AND ON THE STAGE OF THE MICROSCOPE ARE LARGE ENOUGH TO CAUSE CHANGES IN FOCUS.