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When you look at a mirror, a ray of light essentially goes from your eyes to the feet of your image in a straight line. That straight line goes through the mirror at exactly half your height, which means the mirror below half your height isn't even being used. One interesting aspect of this is that no matter how far away from the mirror you get, the half way point doesn't change. Therefore, the useful part of the mirror remains the same no matter how close or far away you are!

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When I look in the mirror I prefer to see my entire image. Knowing if I have toilet paper on my shoe or a cow lick in my hair is important; therefore, I need to know how long the mirror needs to be in order to see all of me.

Determining The Length Needed for The mirror

I don't look like a foot ball player, but the second image accurately depicts the lenght of the mirror needed to see my entire body. In order to see all of myself in the mirror its length must be half my height; therefore, my mirror needs to be 2' 7".

Flat Mirror Information

Law of Reflection -the angle of incidence is equal to the angle of reflection.

Your image is the exact same distance behind the mirror as you are away from it.

It is impossible to see your entire body in a mirror that is less than half of your height.