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A strange optics (or math) problem

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Hello everyone, I was reading a physics book and found an exercise. This time I faced with a really strange one! I can't find out what I am doing wrong! I am really good at physics and math, but sometimes I fail as many people do... :smile:
The answer in the book says ~0.4m, but I am unable to get it (instead of it, I get ~ -0.4m)
I am attaching a Word document with my solution.

I will be looking forward to getting the right solution!

Attached Files
File Type: doc SOLUTION OF THE PROBLEM.doc (46.5 KB)

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