Most lenses used to view smaller things is a convex: Telescope, microscope, binoculars, etc.
You would use a microscope
convex lens
lens technology
compound microscope
the light microscope
single lens
a compound microscope has only one lense
The lens that you should use to first look at a slide on a microscope is a low power lens then move on to a higher power for more clarity.
microscopes use the lens
A simple microscope similar to a magnifying lens.
If a microscope has more than one lens, it is called a compound microscope.
Antonie van Leeuwenhoek created a simple microscope with a single lens, known as a single-lens or simple microscope. This type of microscope was groundbreaking for its time and allowed Leeuwenhoek to observe and describe various microorganisms for the first time.