Unveiling the Secret Behind Optical Confusion in Photography

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SUMMARY

The discussion centers on understanding the optical principles behind the distance of an object from a mirror in photography, specifically referencing a diagram that indicates a lens-mirror separation of 25 cm. Participants clarify that the object distance is calculated based on the midpoint of this separation. The key takeaway is that the distance from the object to the mirror is effectively half of the total separation, which is 12.5 cm.

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http://www.picamatic.com/show/2008/08/13/02/806039_901x355.JPG

This is not a 'question.' I'm just trying to understand what trick they pulled to get the 'distance of object from the mirror.' It's probably obvious to many, but not to me! Please help
 
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The diagram shows the lens-mirror separation as 25cm.
The questions says that it is midway.
 

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