# Optical Instruments: Simple Microscope Essay

730 Words Jul 15th, 2015 3 Pages
Optical Instruments: Simple Microscope

A simple microscope was constructed with two positive lenses and observed. Using the thin-lens equation, the focal length of three given lenses were examined and used to find the angular magnification of the microscope. After the angular magnification was calculated, a to-scale ray diagram was drawn to identify the findings.

1. Introduction A compound microscope has a magnification by two lenses. One of the lenses is objective, which produces a bigger image of the object. The second is an eyepiece lens that is used like a simple magnifier to see the image1. Angular magnification, M, is defined as an angle subtended at eye using an instrument, divided by the angle subtended at “unaided”
For real images, light actually converges, while virtual images are places that show where light appears to have converged, or where light doesn’t reach5. The three magnification measurements found where the magnification of both the objective (Mo) and eyepiece (Me) lenses, as well as the final angular magnification (Mθ), which were as follow;
Mo: 1.47, Me: 4.50, Mθ: 5.89
The Mθ value found was closer to the actual value expected, but some missed calculations could have messed up some values throughout the lab.

4. Conclusion For this optical instruments lab, a simple microscope was constructed using the focal lengths of three different lenses, arranged so that the shortest focal length and the intermediate focal length created an objective lens, and an eyepiece lens. The focal length of the short, or “green” lens was 6.5 cm, while the focal length used of the intermediate, or “yellow” lens was 11.4 cm. The preferred value of the green lens was 5.3 cm, and 10.4 cm for the yellow, but since they were close enough we used our calculated values instead. Although the final angular magnification value found was about the number we were looking for, some calculation errors could have caused a mess up, as we had some “understanding” troubles through the lab, but overall found an acceptable number of 5.89 cm.

5. Acknowledgements
I thank

## Related Documents

• ###### Optical Pulse Oximetry Is A Major Cause Of Organ Abnormality And Death

Abstract— Optical Pulse Oximetry is feasibly the greatest advance in patient monitoring. Pulse Oximetry enables oxygenation, an important physiological variable that is poorly detected by clinical means, to be monitored continuously and easily. Hypoxemia is commonly found in all aspects of medical practice and is a major cause of organ abnormality and death. It should be widely available and used routinely in clinical practice both in primary care and in hospital. This paper will design a non-invasive…

Words: 1467 - Pages: 6
• ###### Essay The Physics Of Advanced Microscopes

The development of advanced microscopes has enabled scientists to further their investigation on the criteria for life. As a result, biologists have been confronted with a baffling question: is there a size limit on life? If so, then just how small can something be before it can no longer be considered alive? Ever since the discovery of nano-sized particles called “nanobacteria” or “nanobes”, researchers have been scrambling to unravel and analyze the mysterious functions of these purported organisms…

Words: 1171 - Pages:
• ###### Essay Optical Images Of Lenses And Lenses

this experiment. Part 1 focuses on measuring the focal length of a converging lens. The second part of the experiment focused on obtaining the refractive index of the lens. The equipment used to obtain the focal length of the bi-convex lens was an optical bench and ruler, light source, screen and a cross-hair (used as the object). An estimate of the focal length of the lens was measured by focusing a faraway light source on to a sheet of paper. The light source was far enough away so that the term…

Words: 1124 - Pages:
• ###### Essay The Brain 's Optical Eyes

The Brain’s Optical Eyes Did you know that about forty percent or more of the human brain is thought to involve vision? The brain controls the vision system and without it, seeing is impossible. Even though the eyes are the only tool the body has for seeing the world, vision is not always accurate considering how the brain interprets perception. .Eye optics are more complicated than most people assume. It is important to understand eye optics because detecting and fixing eye problems in an individual…

Words: 923 - Pages: 4
• ###### Essay on Exploration of Light Microscopes

Light Microscopes What does the word microscope mean: The first part of the word "Micro" means tiny. The "scope" part means to look at or view. Microscopes are tools that are used too enlarge images of small objects so that they can be studied. A light microscope is an instrument made up of two lens they are eyepiece lens and the object lens combined they produce a much greater magnification that what is possible with just one single lens. The microscope also…

Words: 775 - Pages: 4
• ###### Essay Lab Report On The Microscope

in the lab was about the microscope and I leaned a lot of things related to it.The entire class was required to analyzed the wet mount and dye specimen by using compound microscopes. I found that activity very excited because I haven 't touched a microscope since I was in middle school. The microscope is a very relevant optical tool which is used to observe and analyzed very small specimens.These specimens can be from animal, plants or human being oriented. The microscope used a combination of ocular…

Words: 1031 - Pages:
• ###### Compound Microscope Parts Essay

|Compound Microscope Parts | |[pic] | |A high power or compound microscope achieves higher levels of magnification than a stereo or low power microscope. It is used to view smaller | |specimens such as cell structures which cannot be seen at lower…

Words: 697 - Pages: 3
• ###### History of the Microscope Essay

Beyond this point, the human unaided eye fails to help us; the amount of detail that it can provide is severely limited.In order to overcome those limitations, humans started to develop instruments like the magnifying glass, the spectacles, the telescope and the microscope. The earliest development of the microscope can be traced back to the ancient world with the appearance of the magnifying glass, which was at that time use as a “burning glass.”The conception of the action of the magnifying glass…

Words: 2864 - Pages: 12
• ###### Optical Sensors Essay

Introduction- An optical sensor is a device that converts light rays into electronic signals. It measures the physical quantity of light and translates it into a form read by the instrument. One of the features of an optical sensor is its ability to measure the changes from one or more light beams. This change is mostly based on the alteration of the light’s intensity. Optical sensors can work either on single point method or through a distribution of points. The major importance to the proper…

Words: 765 - Pages: 4
• ###### Essay Optical Properties Of A Si

OPTICAL PROPERTIES The optical properties of the a-Si:H are given by its absorption coefficient and optical band gap. a-Si:H absorbs 100 times more than c-Si. This is because it behaves like a direct gap semiconductor. 1 micrometer thick layer is sufficient to absorb 90% of usable solar energy. Another advantage is that its optical band gap can be varied by varying hydrogen content. ELECTRICAL PROPERTIES The electrical properties of a-Si: H are characterized in terms of dark conductivity and…

Words: 1928 - Pages: 8