Unveiling the Secret Behind Optical Confusion in Photography

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The discussion focuses on understanding the optical illusion created in a specific photograph, particularly regarding the distance of an object from a mirror. The image features a lens-mirror separation of 25 cm, which is noted to be at a midpoint. Participants express confusion about how this setup influences the perceived distance and the resulting optical effects. Clarification is sought on the techniques used to achieve this visual trickery. Overall, the conversation aims to demystify the principles behind the optical confusion presented in the image.
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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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