How far can the naked eye see lightning and how far can the human eye see?

People can usually see lightning from a distance of about 50 kilometers. Lightning and thunder occur at the same time, but the speed at which they travel through the atmosphere varies greatly, so people always see lightning first and then hear thunder, light can travel about 300,000 kilometers per second, while sound can only travel 340 meters.

According to this phenomenon, we can calculate the distance from where the lightning occurred and the distance from us from the time the lightning was seen to the time when the thunder stopped, and if the lightning heard thunder every 10 seconds in the northwest, the wheelchair was about 3,400 meters away from us.

Lightning can sometimes threaten human safety, and although the chance of being struck by lightning is much smaller than the probability of winning the lottery, there are still many people in the world who are unfortunate enough to be struck by lightning. Records show that in 1975, 21 people crammed into a hut were unfortunately struck by lightning and all were killed. In 1994, a group of oil storage tanks in Egypt's Dronca region was struck by lightning, flooding with oil and causing a fire that killed 469 people.

The farthest an object can be seen with the human eye depends on a number of factors, such as the size of the object. If an object is large, then the human eye can see it even if it is far enough away. But if the object is small, even if it is close enough, it cannot be seen by the human eye.

This brings us to the problem of the ultimate angular resolution of the human eye.

The farthest distance a person can see the sea s (unit: km) on a clear day can be estimated using the formula s squared = where h is the height of the eye from sea level (unit: m).If a person stands on the shore and observes, he can see when the eye is at the height of the sea level.

A: If you climb an observation deck, how far can you see when your eyes are 35 meters above sea level?

Human eyesight is different, normal people's eyesight, photopic distance is 25cm, 4km away from the scenery is not easy to see, when more than 500m, there is a blurred image of the scene, the distance is shortened to 250 270m, the outline of the scene can be seen clearly, if you want to identify the species of flowers and trees, it should be shortened to dozens of meters.

There is a limit to the range of human vision, and the average distance to see a fighter jet in the air is about 8 kilometers, which is the average on a clear day. When there is fog, rain, and dusk, visibility is very poor, and the distance you can see is greatly reduced. And everyone's eyesight varies greatly, with some pilots being able to see an airplane from 20 kilometers away, while others not being able to see as close as 8 kilometers.

In addition, it has a lot to do with the size of the aircraft, and for the bomber you can see a little farther. There is another feature of the naked eye, if you have seen the aircraft, keep staring at the plane and let the plane gradually fly away, you can not see it after more than 10 kilometers. On the contrary, looking for an airplane in the sky, sometimes it has flown to a distance of 5 kilometers and cannot be found.

8 km is currently a generally accepted (and not explicitly defined) value.

Of course: a pair of normal eyes can see at infinity. At night, you can see the moon 380,000 kilometers from Earth, and even stars hundreds of millions of light-years away. But the resolution of the naked eye is limited, and the difference is very large.

According to tests, the resolution of people with normal vision is about 1 in 2,000 to 1 in 5,000. For example, if you are standing next to the *** Memorial Hall in Tiananmen Square, Beijing, 400 meters away from the national flag, if you can see the top of the flagpole with a diameter of 20 centimeters, your eye resolution will be 1 in 2,000. In this way, when you take an airplane and look down at the ground at an altitude of 10 kilometers, you can clearly see the railways, highways and the Great Wall with a width of more than 5 meters.

Human beings on the earth are also affected by the surface of the earth, so to look at objects on the earth, in addition to making the object meet the intensity of the reflected light of the human eye, it must also be within the "visual range of the surface of the earth". Under normal circumstances, in an unobstructed opening (e.g., on the surface of the sea), as long as there is no problem with the light, the "naked eye" (i.e., without the help of telescopes, etc.) can see a large ship from 20 kilometers away.

How far can a human eye see? Scientist: You can see the world 2.5 million light-years away.

The human eye can see as far as it can see, as long as there is light, the human eye can see. At a distance of 10 meters, we may not be able to see each other's faces clearly, but on the mountain, we can see the scenery from a kilometer away. The ancients wanted to be poor and go to the next level.

The reason why we can see the moon 380,000 kilometers away and the sun 152.1 million kilometers away is because there is a light source. As long as light enters the human eye, the brain can analyze it. So the distance you can see with the naked eye has nothing to do with how far you are, so theoretically you can see infinity as long as light enters the eye, and as long as the light touches an object with mass, the light will be weakened and may be completely absorbed.

Because light is a kind of energy, just like sunlight is warm because there is energy, the stronger the light, the greater the number of photons. So that's why we can't see how far away from the Earth, but we can see the Sun far, far away.

The visual distance increases as the object increases, and the larger an object, the farther we can see it.

To what extent can you see clearly? Everyone's eyesight is very different, in the sky clouds (above 3000m), you can generally see 8km, and some can see 30km (civil aircraft), which can be comparable to short-range radar.

Theoretically, the distance of the human eye ** is 10cm - infinity. It's just that the farther it goes, the smaller the angle of view and the lower the sharpness.

I can see the North Star...... far away

1. When a person is on the earth, looking at the horizon, he can see about a kilometer at the farthest.

The square of the radius of the earth plus the height of the person minus the square of the radius of the earth is the distance that a person can see on flat ground.

Average radius of the Earth: about 3959 miles (km).

Set the height of the person's line of sight to be meters, and substitute the above formula to get 4372 meters.

The principle is to make a tangent to the earth from the position of the human eye, and the tangent point is the farthest place that a person can see.

2. When a person is on the earth and looks at the sky, he can see as far as 225 light years.

At present, the observable universe is about 45 billion light-years, which is a sphere with a diameter of 45 billion light-years with the Hubble telescope as the center, so people on the earth, looking at the sky, can see as far as 25 billion light-years away starlight.

The question of how far a person can see is not scientific, because the distance that the human eye sees is not related to the eyes, but depends on the number of photons entering the pupil at the same time, and everyone sees differently because the number of particles that enter each person's eye is different.

Photons also have different colors, and it must be said that green photons cannot be felt by humans if the number of photons entering the eye is less than five. Moreover, according to scientists' speculation, it is estimated that the detection limit of the human eye is 40 photons per second into the eye. The farthest object seen by the human eye is the Great Andromeda Nebula, 2.2 million light-years, which is brighter than the Milky Way.

This distance is related to the height of the object on which the text is displayed.

Maximum viewing distance: 200 object height in meters

The simplest eye structures can detect the light and darkness of the surrounding environment, and the more complex eye structures can provide vision. Compound eyes, usually found in arthropods (e.g., insects), usually consist of many simple small ocular surfaces, and produce a single image (not as many images as is commonly imagined).

In many vertebrates and some mollusks, the eye imprints light by projecting light onto the light-sensitive retina, where light is received and converted into signals that are transmitted to the brain through the optic nerve. Usually the eye is spherical, filled with a clear, gel-like substance, with a lens for focusing, and usually an iris that controls how much light enters the eye.

In the pure air, the human eye can see a candle 27 kilometers away. Ships can be seen from 6 to 25 kilometers away from the sea. If you are on the top of a high mountain, your vision can be expanded to 320 kilometers.

If you look up at the starry sky, you can see artificial satellites 1,000 kilometers away, and you can also see constellations tens to thousands of light-years apart.

Here's what you might use in your life – estimate how far away you are from these vaguely recognizable objects:

Target distance.

Multi-storey buildings 8 km 10 km.

Bungalows 5 km to 8 km.

House windows 4 km.

Single person 2 km.

Cap 400 meters.

Eyes, nose, fingers 60 meters.

Hope my answer is helpful to you o(o haha

How far can the human eye see? It's incredible to run out of the galaxy as soon as you wake up! How far can the human eye see?

It's incredible to run out of the galaxy as soon as you wake up! How far can the human eye see? It's incredible to run out of the galaxy as soon as you wake up!

The stars are not far away, the stars that people can see are all within the Milky Way, and globular clusters are tens of thousands of light-years at most.

The farthest material that can be seen with the naked eye is the extragalactic galaxy "Andromeda Nebula", located 2.4 million light-years from Earth.

The theory is infinity, and in real life it is related to the size of the object, for example, the sun is far enough for you to see clearly, but if two people are standing 1cm apart, the distance reaches 10km and it is not clear to see.

There is a math problem for everyone: Suppose a person is standing on the equator, the human eye is 20 meters above the ground, and the sea horizon is looking in the direction of the equator, how far can you see at this time? Look at it in the diagram. Suppose OA is the equatorial radius R, and the person stands.

As long as the image light waves of such an object can reach your glasses, you will be able to see it.

What is the farthest line of sight a human can see?

The constellation Andromeda, with an area of 722 square degrees, in this constellation, the brightest Alphd star and the three stars of Pegasus form a striking large triangle, and the two columns of second- to fourth-magnitude stars extending eastward are easy to see in the city or in the countryside, and there are some celestial objects that are far away from us because they are close to the bright objects in this constellation, so they can be observed.

This constellation contains many celestial objects: a bright cluster that can be observed through binoculars, a host galaxy, a striking binary star, a planetary nebula, and the main galaxy is the Andromeda Galaxy, which is located 2.2 million light-years from Earth and is the home star of the Earth with the naked eye.

The farthest objects that can be seen, the Andromeda Galaxy and the Milky Way are the main members of the Honda Group, which is a group of galaxies that are gravitationally combined, most of which are small, weakly lit dwarf galaxies that are almost scattered in the celestial regions because of their proximity to the mother planet.

In the southern part of the constellation Casseus, between Perseus and Pegasus is the constellation Andromeda, which occupies a wide space, more than 30 degrees long from east to west, and has four bright stars in between.

δ in a column, stretching from northeast to southwest, reaching the constellation Pegasus, across the entire constellation, the star and the three main stars of Pegasus form a striking large quadrilateral, and the three stars in the constellation are bright stars of second magnitude.

There are many beautiful double stars and concentrating stars in Andromeda, the star is a triad star, its main star is the 23rd orange-yellow star, and the child star is the 50th yellow star, the color of this companion star often changes, one will be yellow, gold, cyan, one will be orange, blue, people say it is "the first beautiful star in the heavenly world". Using a large telescope, you can see that the companion star itself is a double star, which is composed of two substars of magnitude 55 and 63 that are 1" apart, so the star is a conjunction.

There are quite a few nebulae and star clusters in the constellation Andromeda, among which the Andromeda Nebula M31 is particularly famous. On a clear night without a moon, the faint light of a white cloud that looks like a star can be faintly seen with the naked eye from the north meridian U star near V star, which is the Great Andromeda Nebula. Right next to the great nebula in the constellation Andromeda, there is a very beautiful and rich planet, and that is Andromeda.

Eh: It depends on your eyesight, right?

Also look at something.

Two kilometers away, o( o Thank you for adopting!

Lightning and thunder occur at the same time, but the speed at which they travel through the atmosphere varies greatly, so people always see lightning before they hear thunder. Light can travel about 300,000 kilometers per second, while sound can only travel 340 meters. According to this phenomenon, we can calculate the distance from us from the time we see the lightning to the time when we hear the thunder.

If lightning is in the northwest and thunder is heard every 10 seconds, it means that the thunderstorm is about 3,400 meters away.

The speed of propagation of lightning in the air is approximately equal to the speed of light c = 3x10 8m s

The distance at which a person can see a lightning flash on the earth s=ct=3x10 8m sxt

By substituting the time difference between hearing thunder and observing lightning, we can calculate the distance at which a person can see lightning on the earth.