Question

complete the sentence below: the fact that a slide generally stays in focus as you go from a lower power objective to a higher power objective refers to the fact that our microscopes are choose your answer...

Explanation:

The question is about microscope properties, specifically the ability of a slide to stay in focus when changing from a lower - power to a higher - power objective. This property is known as "parfocal". Microscopes that are parfocal have this characteristic where the image remains in focus (or nearly in focus) as the objective lens is changed from one power to another (from lower to higher magnification in this case).

The key concept here is the parfocality of microscopes. Parfocal microscopes allow the slide to stay in focus when switching from a lower - power objective to a higher - power objective.

Answer:

parfocal (the microscopes are parfocal)