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There is a convex lens 3/4" on the outside and 1 1/2" convex lens on the inside.
Each lens has one flat side facing out and one convex side facing in.

What can be done to correct this image?

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If you already know the basics of ray optics you may find that the lens maker's equation is a big help in estimating the expected behavior of simple systems for which you have only eyeball measurements. –  dmckee Jul 3 '12 at 23:00
    
This operation is called "image erection" and is usually accomplished with a prism. Google "Porro prism" or "roof prism" –  user2963 Jul 4 '12 at 1:55
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