I'd love it to be correct Chris but after thinking about it I don't see how you can look along a line that is not in line with your eyes and get a true reflection.It may get close if the selected plane was close enough to the "eye plane "but your'e still splitting the differece between the two planes-if my understanding is correct.I think you will be viewing from above plane from the ground back up.
A picture's worth a thousand words - if you go to my user profile by clicking on ChrisNZ to your left, and going to my user profile, then I've posted a profile picture of Sergio with some lines drawn on it to demonstrate, how, with the aid of a mirror, Sergio could see the clubshaft plane at address looking 'up the plane' so it appears as a line. (No way of uploading pictures for me, so this'll have to do as a work around!)
The black lines represent the line of sight. The short red line by the ball represents the mirror, and the long red line shows the angle of the mirror (halfway between the two black lines).
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