Discuss Mirroring an image in the Photoshop Help forum on Dev Shed. Mirroring an image Photoshop Help forum discussing Photoshop and other Adobe products predating Adobe’s 2005 purchase of Macromedia, including Illustrator, GoLive, LiveMotion, Atmosphere, InDesign and Acrobat.
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Not sure of your photoshop version, but you should find the menus are almost the same place
1. Choose Image > Canvas Size, and double the width of the canvas.Use the anchor to anchor the image to one of the sides.
2. With the background layer selected Choose Layer > duplicate layer
4. Now click on the new layer called background copy and tap V on your keyboard, You can now Move the selected layer to the side where the other layer is not residning.
5. Choose Image > Flip Horizontal
Its now mirrored.