I Difference between Working distance and object distance

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Working distance and object distance are distinct concepts in optics; object distance is measured from the lens's hypothetical center, while working distance is from the lens's actual front surface. For a thin lens, these distances can be approximated as equal, but in practical scenarios, they differ. Additionally, image distance and back focal length are also different, with back focal length referring to the distance from the lens to the image plane when focused. To calculate the focal length, object distance, and image distance for a desired magnification, specific formulas related to lens optics must be applied. Understanding these distinctions is crucial for accurate optical calculations and applications.
Aymangh994
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So I have a problem understanding the difference between working distance and the object distance of a lens.
For me it is also unclear what the difference between image distance and back focal length.
If I want to enlarge the image by 6. How can I calculate the focal length, object distance and image distance ?
Is the working distance the same as object distance ?
 
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Typically only for a perfectly thin lens (which can be a useful approximation). The object distance is measured from the hypothetical lens center and the working distance from the actual front surface of the lens. In the real world dthay are not the same.
 
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