Orientation of Image Produced by Double Convex Lens

[LNH]

This is not really a problem, more just a fact-based question. I have been using the Google, but I have been unable to find an answer. Is there a way to induce the answer that I am missing?

Question: What range of distance does a double convex lens have to be from an object to produce an image that is horizontally flipped?

 

[Brage]

Hiya, I think I might be able to help, basically you need to have the object be at a distance far enough so that you can effectively approximate that all the ray's coming from the object are parrallel, as if not you get a weird mixture of a flipped image and a right side up image superimposed (which means you won't see the actuall image at all but a weird blur). This ofc depends on the object's size as well, a really small object does not have to be as far away as a really large object. Hope this helps.