That's a deep question.
optical microscope
Viruses are too small to be seen with a light microscope because they are smaller than the wavelength of visible light. This means that light cannot pass through them or be reflected off of them, making them invisible under a light microscope.
You would typically use a high magnification objective lens, such as 40x or 100x, to see small objects with a microscope. This allows you to view the details of the object at a much larger scale than with lower magnification lenses.
Magnifying glass, microscope, and telescope are tools that make objects appear larger. They use lenses to magnify and focus light to enhance the visibility of small objects.
Things that are very small, such as viruses, bacteria, and the detailed structure of cells, are only visible with an electron microscope due to their size being beyond the resolution of light microscopes.
The instrument used to make extremely small things look larger so humans can see them is a microscope.
Magnifying Glass, Microscope
To make distant things closer they use a telescope, to make close things larger they use a sense or magnifying glass, to make very small things larger they use a microscope. to make incredibly small things clearer they use mathematics.
Common types of microorganisms that can be seen under a light microscope include bacteria, yeast, algae, and protozoa. These microorganisms are relatively larger and can be observed with a brightfield microscope at higher magnifications. Viruses, which are much smaller, typically require an electron microscope for visualization.
A magnifying glass. Binoculars. A telescope. A miscroscope.
A Microscope.
A microscope is very nice for looking a things that are smaller than we can see with by using just our eyes. These microscopes were what were used to first see bacteria and other very small organisms.
To see small things
to see small things
To look at small things.
Small things.
A magnifying glass, or to REALLY enlarge things, a microscope.