You can see your cells using the scanning and the 10x objective lenses. You cannot focus on anything when you add oil to your slide and move to the oil immersion objective. Your instructor comes over and wipes off your oil, turns over the slide, adds new oil, and moves the oil immersion objective into place. You can now focus on your cells. Knowing how immersion works, why couldn't you see the cells when the slide was upside down?

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A:

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