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No, he did not blow it completely. Yes, you, standing by the mirror will see an image of the ruler 12 inches high. That is not the point. We are talking about living things with eyes. If the ruler were alive and had eyes on the top end, it would truly see itself as a 6" image in the mirror. Try it yourself. Find a full length mirror. Walk up until your nose is touching it. Put a mark on the mirror at the top of your head and one by your feet. You will find the marks roughly half of your height apart. It is only approximate since your eyes are not at the very top of you. Most people can see all of themselves in a 3+ foot mirror. And it doesn't matter how close or far from the mirror. A full length mirror is a waste of money. Try this webpage for a good diagram and explanation: http://www.glenbrook.k12.il.us/gbssci/phys/Class/refln/u13l2d.html