Answer:
compound microscope is the correct answer.
Step-by-step explanation:
The compound microscope uses multiple glass lenses to help distinguish details of thickness.
A compound microscope uses an ocular lens and an objective lens to magnify an image and see features of thickness for an observer.
A compound microscope is heavier and costly as compared to simple microscopes as it has multiple lenses.
Compound microscopes can magnify parts fully as it can reach a high level of magnification so that the observer can observe cells and thickness.