That's because a mirror does not reverse images left-to-right or top-to-bottom, but from front-to-back. In other words, your mirror image hasn't been swapped, but inverted along a third dimension, like a glove being turned inside out. Here's a thought experiment to help illustrate the concept of front-to-back reversal. Assume, for a second, that you are capable of squeezing your body perfectly flat. Imagine, also, that your body is able to pass through itself, without damaging any of its various tissues.
When you stand with the tip of your nose pressed gently against a mirror, it's easy to assume that the image you see looking back at you is the result of non-mirror you turning in-place degrees and stepping backwards, through the mirror, into mirror-land. This is not the case. In actuality, the back half of non-mirror you has been pressed flat in the direction of the mirror.
As your form began to pancake, the front half of your body that is, all parts of your body situated behind the tip of your nose, but still in front of the back half of your body , the back half of your body and the tip of your nose all came to reside within the same plane i. This new, inverted you is symmetrical to you, but your two bodies cannot be superimposed.
But Obi-One although a clone is still a Jedi. What if he wanted to go to the other side of the mirror by going over the top? Here is a picture of that. In this case, Obi-One and the image of Obi-Wan have right hands on the same side. However, their top and bottom are reversed. So, now we can see the problem. The problem of the mirror comes from our cultural background. We assume that the image is like someone walking around to the back side of a mirror.
If we assumed that people would get to the back side by going head first over the top, I would be answering a different question. TOP - Now the top is reversed satisfied? This is again the basic in-out reversal. But wait, my right hand is the image's left hand. Both I and my image face East the explanation of facing opposite direction is not working and the in-out operation is done with the top-bottom reversal Sorry Mr. Geoff Steel, the image's head is towards cardinal down, the super Scientific American article is fine but that is not the proper reason, see, in the SIDE case, when a Pormpuraaw wonder girl moves her South hand Southward her helpless image moves her North hand Northward, even in heavenly Australia.
And, well, Physics is not any cause, it is an effort to understand the 'cause'. So what is only left is really that mental process. Our brain tries to place our head downwards facing the same direction and sort out what is right-left. You don't believe? But for TOP, brain is not used to do this. Now you understand that there is a process. The process is the reason. We our brain place s our head first. Still not convinced? Lie horizontally in front of a mirror.
Your right hand is upwards say , your image's right hand is downwards. See, top-bottom with mirror is reversed, but with you it is still left-right reversal. Your brain placed your head horizontally first. Pratap K. Saha, Kolkata, India You guys are making it too complicated.
The text reverses left-to-right because when you turn the paper towards the mirror, YOU'VE reversed the writing left-to-right.
Then you just see a mirror image of it. Try writing on a transparency, and hold it up so you can read it correctly. Then hold it in front of the mirror. If that's all scientists did, we wouldn't get anywhere. Adam Gulyas, Edmonton Canada Close one eye. Look at wall with two windows, but one is actually a mirror. If light bounces off everything in reverse angle, then we should experience mirror image like camera obscura.
But, only one parallax results, not total. Brain should not be able to know difference in mirror and window. It is a mirror image or what you see if you were looking from the mirror but still gazing forward. No, wait. If you look at a mountain in a lake it is upsidedown. We can make other choices of course, and we can easily define such directions for a machine, so the general idea is not really anthropomorphic. Ask two people facing each other to point up: they'll both point in the same direction.
Now ask them to point right. They'll point in opposite directions. They have each chosen one additional direction, say front, before they could specify the direction of right. And because those two people have chosen opposite directions for their front, this has also altered their definition of right. It's remarkable that the laws of physics also have a notion of this "handedness", including a particular choice that Nature makes in one field of particle physics.
But, of course, as children we don't learn our concept of handedness by studying particle physics. Suppose I have a clear notion of which is my right hand. I notice that if I open my right hand and point my fingers forward, then close the fingers in such a way that they rotate to the "up" direction, then my thumb points right. Notice that if any one of forward or up is reversed, the direction of right will be reversed too.
This is an example of applying the "right-hand" rule to sort directions out. The ordered triplet of forward—up—right becomes a "right-handed" set of axes. Mathematicians use this idea to distinguish between sets of axes in three dimensions: the only options for such mutually perpendicular axes are left handed and right handed.
No matter how you rotate them in space, these two sets of axes can never properly "become" each other, just as our hands can never become each other. So when I look into a mirror, what do I see? I see an image of myself that is actually reversed forwards-backwards. That's a strange sort of reversal, and one that's not immediately obvious when we see our image. If I have a freckle on my left cheek, what do I see in the mirror?
Just as that freckle is on the same side of my body as my heart, so too the man in the mirror has the freckle on the same side of his body as his heart.
So he must have the freckle on his left cheek too—and the mirror has not reversed left-right! But now I'm attributing thoughts and an independent existence to the man in the mirror.
0コメント