As I understand, focal length can be found by moving a shining a light source and moving a lens so that the projected image of the source displays sharpest on the surface. The distance from surface to lens is the focal length.

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Related glass types ... N-BK7 is a very pure universal optical glass made by SCHOTT. It is one of the most common standard glass types used to produce high- ...

I have several magnifiers/magnifying-glasses of varying quality with either nothing inscribed on them, or power ratings that I think are wrong.

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Users of ray-optics are encouraged to post questions to the Discussions page of the Github repository. Please post any bug reports to the Issues page in the repo. The author welcomes questions and comments posted on Github and will try to be responsive. The author will not respond to emails with questions about ray-optics.

"Most high quality magnifiers use achromats [a positive simple lens cemented to a negative simple lens] to eliminate color fringing at the edge of objects."

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The power of a magnifying glass is relative to the near-limit distance of the standard human eye (25 cm). The lens makes it possible to bring the object closer to the eye, so that it subtends a larger angle than at the near limit. The ratio of the (tangent of the) angles is proportional to the ratio of these distances.

Schematic: Concave Lens. Concave lenses, also known as diverging or negative lenses, cause parallel light rays to diverge as they pass through the lens.

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In this experiment I simultaneously look at an object (black lines ruled 10 mm apart) which is 250 mm from the magnifier/eye and at the virtual image of mm square graph paper formed 250 mm from a magnifier/eye. Fine adjustment was made by reducing the parallax between the black lines and the virtual image of the graph paper. Although readings are best taken using an eye I have taken a photograph with a hand held iPhone to show what is seen. When viewed with the eye the black lines and the virtual image were sharp but I could not achieve that with the iPhone (right hand) photograph.

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The eyepiece has several major functions: ○ The eyepiece serves to further magnify the real image projected by the objective. ○ In visual observation, the ...

In photography, the metering mode refers to the way in which a camera determines exposure. Cameras generally allow the user to select between spot, ...

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To experiment, I measured the focal length of one my loupes to be about 9mm, and the diameter of the lens about 16mm. Using the formula mentioned above, that would give me a magnification power of 9/(9-16) = -1.29x ...Which I feel cannot be right. It is much stronger and should be more around 20x or 30x. Plus, the image is not inverted, so the magnification should be a positive value, correct?

This project has been set up using PyScaffold 4.3. For details and usage information on PyScaffold see https://pyscaffold.org/.

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A method which is relatively easy to perform uses a plane mirror and finds the position of a virtual method by using no parallax.

RayOptics is a Python geometrical optics and image forming optics library. It provides a geometric ray tracing foundation for the analysis of image forming and coherent optical systems. A number of standard geometrical analysis options such as transverse ray and wavefront aberration analysis are provided on this base. Paraxial layout of optical systems is also supported by y-ybar diagrams and graphical editing of paraxial rays in lens layout views. Import of Zemax .zmx and CODEV .seq files is supported. RayOptics can be used in Python scripts, the Python and IPython shells, the Jupyter notebook, and a Qt-based graphical user interface application.