Microscopes are critical to examining and understanding objects and specimens invisible to the naked eye. There are some of the best stereo microscopes that help you study the samples using two types of lenses (objectives and eyepieces). At the same time, electron microscopes have a more complex assembly. However, microscopes in the past did not have multiple lenses. The earliest microscopes (single-lens microscopes) had only one lens; used in some situations even now. This article focuses on how you can change the power of a single-lens microscope.
So, let’s tell you everything you need to know about single-lens microscopes.
Table of Contents
What is a Single Lens Microscope?
As the name suggests, a single lens microscope has only one lens compared to multiple lenses in recent microscopes. These microscopes are the primary instruments that scientists invented to observe microscopic organisms. The single lens worked as the objective and eyepiece by producing images of illuminated samples.
Magnifying glasses are single lens microscopes used widely in different fields to study the details on the surface of objects.
History of Single Lens Microscope
Researchers started working on creating a magnifying instrument as early as the 16th century, which gave birth to the very first microscope. Hans and Zacharias Janssen, the pioneers in the microscope world, prepared a microscope with a convex lens.
Later, Antony van Leeuwenhoek polished a glass ball into a lens to make the world’s first practical microscope. Attached to a metal holder with screws, the convex glass lens offered 270x magnification. This is the single lens microscope.
Now that you know about the history of the single lens microscope, here’s how you can change the power of a single lens microscope.
How Can You Change the Power of a Single Lens Microscope?
Changing the magnification power of a single lens microscope uses the same parameters as a magnifying glass we usually use. Thus, the objects appear most distinct at a distance of 250 mm from the sample.
You can change the power of a single lens microscope by adjusting the focal length.
Increasing the power of a single lens microscope requires reducing the focal length. At the same time, you will also need to reduce the lens diameter, or you might not be able to see through the lens after a point.
Uses of Single Lens Microscopes
With the advent of compound and electron microscopes, single lens microscopes are not used in microscopy anymore.
However, objects like reading glasses, pocket magnifiers, magnifying glasses, and jewelry eyepieces use single lens microscopes to magnify samples. So, these applications make single lens microscopes an essential part of our lives despite using optical microscopes in research.
The Bottom Line
Humans have always been curious about observing things around them, even those invisible to the naked eye. This quest led to the invention of the earliest microscopes in the 16th century by Hans and Zacharias Janssen. Later Antony van Leeuwenhoek modified the microscope with 270x magnification, the first practical single lens microscope. If you wonder, “How you can change the power of a single lens microscope,” it changes with the focal length. To increase the lens magnification, decrease the focal length, and vice versa.
Where is the lens located in a microscope?
On the nosepiece lies the objective lenses that can be easily switched to change the desired magnification. On the other hand, the eyepieces are in the eye tubes and allow you to see the specimen images.
Where are the two lenses located in a compound microscope used in most classrooms today?
Most classrooms use the best compound microscopes with eyepieces and objective lenses to observe specimens. The eyepiece shows you the magnified observation produced by the objective lenses. However, the eyepieces also have 10x or 25x magnification for better imaging.
How do you adjust a microscope to a high power?
The objective lenses on the nosepiece can be rotated to bring the desired magnification lens over the specimen. Then, move the fine adjustment knob slowly to focus on your specimen.