I bought a mirror 9ft *4ft and image is alright till 10 ft away from the mirror after that it's distorting the image and thickening it.How can I solve this problem?

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    I guess you need to check the mirror is flat using a straight edge at least as long as your mirror, a 9ft length of glass can bend enough to slightly distort a reflection. You can then adjust the supports and add shims or extra support. Probably your wall is not exactly flat (few are). – RedGrittyBrick Jan 11 at 14:52

Because the surface you affixed it to is not flat

A mirror that large can't rely on its own stiffness to stay straight. It is relying on the underlying surface. Glass can bend a little bit. Your surface is bending, so the mirror is bending, so you have a funhouse mirror.

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