Reflections on reflections.
The image of your reflection is always half the size of the real thing.
To test this you can make a cutout of your face. The cutout is the right size to cover your reflection when stuck to the mirror.
It still works just the same when you move further away or nearer.
The cutout is half the size of the real thing.
Prompted by @itsDanBull and @amuchmoreexotic
People are pretty bad at this and tend to overestimate the size of the image:
http://scienceblogs.com/cognitivedaily/2009/03/mirror_images_you_dont_perceiv.php
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