Question

microscope use:

1. when focusing a specimen, you should always start with the ______________ objective.
2. when using the high - power objective, only the ______________ knob should be used.

Explanation:

In microscopy, start with low - power objective for initial focusing. With high - power, only fine - adjustment knob is used to avoid crashing the lens into specimen.

Answer:

1. low - power
2. fine - adjustment