Question

1. what was the first instrument used to observe microscopic objects?

electron microscope
glass lenses
light microscope
magnifying lenses

Explanation:

The first instrument used to observe microscopic objects was the light microscope. It was developed in the late 16th century. Electron microscopes came much later (20th century). Glass lenses and magnifying lenses are components rather than complete instruments for observing microscopic objects in a systematic way like a microscope.

Answer:

light microscope