Sagot :
Answer:
C
Explanation:
D. Is not correct, as turning the coarse adjustment knob can damage the high-power objective lens.
A. Using the fine adjustment knob first will be the wrong way, as it is time- consuming.
B. Maybe the same as D.
So, in this case, C. is the winner, It is effective because using the coarse adjustment knob first after rotating to low objective lens gives big adjustments, then you may rotate the nosepiece to high-power, and use the fine adjustment knob to carefully and precisely magnify the specimen.