Why is it that the image in the mirror can be reversed left and right, but not upside down?

But it's like a fish in the throat, and it doesn't vomit unpleasantly. I finally remembered it today, I checked it on the Internet, and there were a lot of answers, but I still had to think about it for a while to figure it out.

There are several answers, which may not be expressed correctly, but there are always one or two explanations that you can understand: the mirror symmetrical axis is the central axis of the person. If you lie down, your head and feet will be upside down.

Because your eyes are long from side to side, not up and down. Standing in front of the mirror, left is left, right is right, up is up, bottom is down, the same; It's just an illusion of the eye, and the projection of the object on the visual membrane is originally inverted, but who thinks that people are head-to-foot. You find a new spoon, you want a standard semicircle, and look, it's all upside down.

Maybe the mirror thinks that with your appearance, there is not much difference between upside down and not upside down Hehe Actually, the person who looks in the mirror sees himself in the mirror: the top is still up; The next is still down; The left hand is still on the left side of the mirror; The right hand is still on the right side of the mirror, so, in fact, there is no upside down, up, down, left, right. It's just that you're used to looking at the person opposite, and the other person's left hand is on your right; The opponent's right hand, on your left.

So, you think of yourself in the mirror as the person opposite, which is just an illusion of yourself. What is in the mirror is a virtual image, it is a symmetrical image with a mirror, and the virtual image in the mirror that the person who looks in the mirror is of course still on it; The next is still down; The left hand is still on the left side of the mirror; The right hand is still on the right side of the mirror! It is not a lens that is a real image of the real light through the focal point, because the light is an image made by passing a point, so the up, down, left and right are all inverted.

Because the image of a flat mirror is symmetrical to the mirror of the object, that is, your head is above, your feet are below, your left hand is on the left, and your right hand is on the right. But in the past, people had to turn around, and the left and right were reversed. How to turn it upside down depends on the spatial position of the eye, because the eye is left and right, so it seems to be upside down.

When the neck is crooked, it is upside down.

Because the image of a person and a person are symmetrical with the mirror, and the mirror is placed upright, the person in the mirror is upside down, and the person standing on the mirror is upside down.

In the mirror, the concept of left and right is not the same as the concept of up and down. If the observer stands in front of the mirror, and she defines the up, down, left, and right from her own perspective, and as a reflection in the mirror, she also defines the up, down, left, and right from the image itself, then there is no reversal of everything; That is to say, when you observe your image in the mirror, you use your own concepts of left and right as reference directions, and use the ground (the common reference) to define up and down; If you use any third-party references, you get it. For example, east, west, north and south.

Imagine that if there was an analogue dial in front of the mirror, the minute hand and the minute hand of the image in the mirror would point in the same direction in the orientation system of the outside observer at any given moment.

Because you can't look in the mirror.

Because the eye only has the left eye and the right eye.

You use a spoon to see if it's upside down

The key is what to look at!

Also, take care of it with the back arched again, it's a big head!

The imaging principle of the plane mirror can be explained, and the optical path diagram can be drawn clearly.

Because it's not a rearview mirror.

Look in the mirror. Mirror.

All. Approximately erected. Mirror. Extra-mirror.

Try. Mirror. Approximately flat. Upside down. Straight. Other.

Decisive. Plain. Two. Eye.

Horizontally arranged.

Is this a brain teaser?

Because the image is reversed along the horizontal axis, it is reversed from side to side. The image in the mirror is called a virtual image.

The image in the mirror is called plane mirror imagery, which is often abbreviated as a mirror image. Mirrors with a smooth surface are called flat mirrors, and it is best to use mirrors such as glass that allow light to pass through.

Looking in the mirror is such a principle. It can be said that as long as a flat mirror is used, it must be a mirror reflection.

The image in the mirror is called plane mirror imagery, which is often abbreviated as a mirror image.

Characteristics of Plane Mirror ImagingIn general, as long as it is a plane mirror imaging, it uses the law of reflection of light.

The light of the sun or lamp hits the human body and is reflected onto the mirror surface (note: this is diffuse reflection, not plane mirror imaging). The plane mirror in turn reflects the light into the human eye, so we see ourselves as a virtual image in the plane mirror.

The image in a plane mirror is formed by the intersection of the extension lines of the reflected rays of light, so the image in a plane mirror is a virtual image. The virtual image is equal to the size of the object and the distance is equal. The image is equal in size to the object. So the image and the object are symmetrical to the mirror.

It's as if your two hands, palms facing each other, left and right opposite, up and down the same.

I wondered, can mirrors really turn left and right upside down? When I stand in front of the mirror and stretch out my left hand, the person in the mirror seems to me to stretch out the left hand, but to the person in the mirror, it is its right hand, because I happen to be face to face with it! Two people facing each other, looking at anything, are left and right opposites!

For example, when I am face to face with you, I think my left hand is on my left, and you think my left hand is on your right. Now I understand, the mirror is not actually reversed left and right at all, and the thing on the left is still on the left in the mirror, as long as we look at it from our own angle.

In fact, the mirror can only be reversed before and after, and we reach forward in front of the mirror, and the fingertips are farthest from us, and then in the mirror, the fingertips are closest to us, because it is reversed before and after. It is this reversal that makes us stand in front of the mirror and look at ourselves, always thinking that the self in the mirror is facing us. Because if you think that the self in the mirror is facing away from you, it will be your own face in the mirror with the back of your head, which is quite strange.

However, in order to overcome the reversal of the mirror, we need to turn our self in the mirror backwards, that is, face to face with us, in order to be reasonable. Because people stand on this earth, it is very convenient to turn left and right, and the left and right are not completely fixed, but the up and down are indeed very fixed, even if we stand upside down, we still think that the head of the foot is up, not where the head is, which is up. But the left and right are different, where the left hand is, we think it is the left side.

Therefore, we can only turn the person in the mirror backwards 180 degrees (strictly speaking, backwards and backwards), but not up and down. There are also people here who are symmetrical in it. If people are asymmetrical left and right and symmetrical up and down, for example, people grow into an E-shape, and the world cannot turn left and right casually, but can turn up and down casually, then when we look in the mirror, we will think that the mirror is upside down, but not upside down.

Conclusion: The mirror can neither be upside down left and right, nor upside down, it can only be upside down.

Cause: The image is reversed along the horizontal axis. And when we stand in front of the mirror, our heads are still on top and our feet are underneath. In fact, the mirror is neither upside down nor upside down, but upside down.

When you move in the direction of i, the mirror image also moves in the direction of i, which means that as long as it is parallel to the plane of the mirror, the mirror image follows every movement in reality.

When you move in the J direction, the mirror image moves in the opposite direction, which means that the mirror image is reversed along an axis perpendicular to the mirror. All in all, when you look in the mirror, the left and right, up and down are not reversed, but the "front" and "back" are reversed.

The physical object in the mirror and the image in the mirror should be symmetrical with respect to the mirror face, and if it is reversed, it cannot be symmetrical.