An object is placed 1m in front of a plane mirror. An observer stands 3m behind the object. For what distance must the observer focus his eyes in order to see the image of the object? My guess is that the observer would have to focus their eyes 3m in order to see the image because when the object is reflected off the mirror it is reflected at the same angle so therefore it reflects back at that same 1m spot. I am not quite sure if this is right though. Any help would be appreciated!