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The optics of a mid 18th Century compound microscope: All-brass, Benjamin Martin Compound Microscope (#38) |
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Magnification and Modeling
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Ray diagram showing the lens systems.
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| Obtaining a magnification standard | ||||||||||||||||||||
| Calculated Magnification: Calculations: 11.9x, image inverted Images: 11.67x |
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| The microscope consists of five lenses: The objective lens (5), a "behind lens" (4), a Field lens (3), and the eyepiece (Lenses 1,2). The total magnification was calculated to be 11.9x and observed to be 11.67x. | ||||||||||||||||||||
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| Resolution | ||||||||||||||||||||
| When imaging a micrometer the microscope resolved 100 microns, but not 10 microns The group was able to resolve text with a font size of 1 Thus the resolution of this microscope is better than 100µm. |
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| Optical Aberrations | ||||||||||||||||||||
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The microscope exhibited three monochromatic aberrations:
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Astigmatism
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Field Curvature
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Spherical aberration
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