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Note: are these the choices in this question? If these are the choices, you can consider my answer.
A. 60× objectives with immersion oil and 10× eyepiece
B. 97× objective with immersion oil and 5× eyepiece
C. 3× Objective and a 10× eyepiece
D. 60× objective and 15× eyepiece
Among the choices above, in viewing the bacteria we should use an objective lens that has a magnification of 600 or higher. Thus, the answer is letter A. 60x objectives with immersion oil and 10x eyepiece.
Bacteria are very minute organism so we have to use a higher magnification. Having an objective with 60x magnification and an eyepiece of 10x will give you 600 magnifications. This magnification will naturally use oil immersion since the objective lens is very near the slide of the specimen. Using the oil immersion will avoid the objective lens to crash with the slides. Having an objective with 60x magnification and an eyepiece of 10x will give you 600 magnifications.
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