# Optical Instruments: Simple Microscope Essay

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”

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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