It works because of triangles.
Just start drawing some diagrams and you’ll quickly figure out how on your own. Which is more fun than having someone give you a geometric proof.
Oh yeah look at that. Looks like the measurable size is slightly less than half though since the eyes are generally a little closer to the mirror than the widest part of the head
It works because of triangles. Just start drawing some diagrams and you’ll quickly figure out how on your own. Which is more fun than having someone give you a geometric proof.
Oh yeah look at that. Looks like the measurable size is slightly less than half though since the eyes are generally a little closer to the mirror than the widest part of the head