Mirror Made to Measure

How tall a mirror do you need to see yourself from head to toe? Does the height change if you’re closer or further away? (No!) Using the remote control, you can pull a blind down till the top of the mirror reflects the top of your head; and pull another blind up till the mirror’s bottom just touches your toes. Now measure your tailor-made mirror’s height. (If you’ve forgotten how tall you are, simply multiply the mirror’s height by two.)