Multiple choice

Is it ok to take the high power objective all the way down until it is touching the slide? 

  1. yes

  2. no
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Bringing the high power objective lens into direct contact with the slide can scratch the lens or crack the glass slide. You should always use the fine adjustment knob carefully and avoid touching the slide. Starting with the low power objective helps establish the correct distance safely.

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