Why do all the rainbows you see have a semicircle, do you have a full circle?

The rainbow is originally a circle, but it is just light, which cannot be refracted, and it is seen as a semicircle.

In fact, it is round, but the lower part is covered by the earth, and the main round rainbow must be near the cliff to have a complete circle, in fact, it is round, but the lower part is covered by the earth.

The strongest angle of reflection between the two reflections occurs at 50° to 53°, so the secondary rainbow is positioned outside the main rainbow.

In fact, all rainbows are a big circle, except that we usually stand low, and the bottom half of the circle is blocked by the horizon. Once you stand tall and unobstructed, you may see the rainbow in its entirety.

It is an optical phenomenon seen by the observer, and the position of the rainbow will change with the observer. When an observer sees a rainbow.

The ** inside the arch of the rainbow is actually an image of the sun that is reflected by water droplets and magnified.

Because the place where the rainbow is connected is mostly the surface of the water, there is no full circle.

Because the light is reflected inside the water droplet, the observer sees the spectrum upside down, with red light at the top and other colors at the bottom.

The rainbow is round. Rainbows are formed by water droplets that break down sunlight into different wavelengths or colors. The rainbow that people usually see is semi-arc-shaped because the horizon blocks the lower half of it.

The height of the sun can determine the arc of the rainbow, and the lower the sun is in the sky, the higher the base of the rainbow. It can be seen that the higher you stand, the more complete the arc of the rainbow you see.

Photographer Colin Leonhardt, based in Perth, Western Australia, photographed a fully circular rainbow while travelling past Cocylow Beach. As they passed through the edge of the rain zone, the sun was setting, low and the sunlight created this peculiar rainbow. According to NASA, the phenomenon of an all-circular rainbow has a lot to do with the observer's position, and is mainly formed by the internal reflection of raindrops on sunlight.

The small water droplets floating in the air are like spherical lenses, and after the sunlight hits the water droplets, it is refracted and reflected and refracted into people's eyes. When the original white light enters the water droplet, it will be divided into different colors due to refraction, just like Newton's prism experiment, so the rainbow has different colors. It has been scientifically proven that all rainbows are fully circular, but they are not normally visible from the ground.

In addition to this, there are also fire rainbows, ice rainbows, moon rainbows, etc., which are similar to the round rainbows. Among them, the flame rainbow is an extremely rare sight, and it can only be produced when the sun is at the zenith, the sunlight penetrates through the cirrus clouds at high altitudes, and the cirrus clouds are rich in ice crystals. Therefore, the flame rainbow is also called a rainbow cloud.

First: Because the light source - the sun is round, and the rainbow is the effect of the refraction of the sun's rays, so the rainbow is also round.

Second: Since most of the time you see a rainbow is 8-10 a.m. and 15-18 p.m. During this time, the sunlight has a certain angle with the earth, and the sunlight does not shine directly vertically. So light is also part of a circle after refraction, and most of the time it is a semicircle.

In fact, it is round, but the lower part is covered by the earth, and the main round rainbow must have a complete circle near the cliff, in fact, it is round, but the lower part is covered by the earth, and the main round rainbow must have a complete circle near the cliff, in fact, it is round, but the lower part is covered by the earth, and the main round rainbow must have a complete circle near the cliff.

Because it is hidden by the tall buildings of the earth, only a semi-circular rainbow can be seen.

Why the rainbow you see is usually a semicircleA key factor here is:The position of the anti-solar point。This is a point in the sky, or a point on the ground, where the sun is exactly 180 degrees relative to a person's perspective. In sunny conditions, the head of the human shadow will be markedAnti-sun point

Each rainbow is a perfect circular ring centered on this point.

If a person is standing on the ground, they cannot see the lower half of the rainbow. Indeed, from this point of view, any part of the rainbow below the horizon is invisible. One reason for this is that the proximity of the Earth's surface limits the number and concentration of raindrops within a person's line of sight.

So, the percentage of rainbows that can be seen is directly related to the position of the sun. When our sun is just above the horizon, the involative point will be quite high, which gives a chance to see a larger rainbow.

Conversely, if the Sun is 42 degrees above the horizon, it is impossible for ground observers to see any part of the rainbow.

Things get even more interesting when flying on an airplane. On rainy and foggy days, airplane passengers and pilots occasionally see a full circular rainbow. Fold.

1. The wavelength of light determines the degree of bending of light.

2. In fact, if the conditions are right, you can see a whole circle of rainbows. The formation of a rainbow is the formation of water droplets from the sun's rays in the air that are refracted and reflected towards our eyes. Sunlight beams of different colors The beam that forms a rainbow through the above process has a deflection angle of about 180 - 42 = 138 degrees from the original beam.

In other words, if the sunlight is level with the ground, the upward angle of the rainbow is about 42 degrees.

3. It has a lot to do with the shape of the earth.

4. Since the surface of the earth is a curved surface and is covered by a thick atmosphere, the water content in the air after rain is higher than usual, and when the sunlight hits the small water droplets in the air, the dou accompaniment forms a refraction. At the same time, because the atmosphere on the earth's surface is curved, the sunlight is refracted on the surface, forming the arc-shaped rainbow we see!

The all-round rainbow is mainly formed by the internal reflection of raindrops on sunlight and is related to the position of the photographer.

Once in Australia, a photographer photographed a fully circular rainbow on ***, and the phenomenon of a fully circular rainbow has a lot to do with the position of the observer, mainly due to the internal reflection of raindrops to sunlight. It is said that the all-round rainbow is not actually a spectacle, but it is impossible to see the full circle of the rainbow because of the limited observation on the ground.

Rainbows are formed because of the dispersion and reflection of small water droplets in the sky that are close to a circle when sunlight hits them. When sunlight hits a water droplet, it is incident at different angles and is reflected at different angles within the water droplet. The appearance of a rainbow is not a specific position in mid-air, it is an optical phenomenon seen by the observer, and the blind rise of the rainbow will change according to the position of the observer.

When the observer sees the rainbow, its position is in the opposite direction of the sun, and the position within the arch of the rainbow is reflected by water droplets, magnifying the image of the sun. So the sky inside the rainbow also looks brighter than the sky outside the rainbow. The center of the rainbow arch is generally the direction of the shadow of the observer's head, and the rainbow itself is 40° to 42° above the line between the shadow of the observer's head and the eyes.

When the sun is above 42° in the sky, the position of the rainbow is not visible below the horizon, so the rainbow rarely appears at noon.

In the United Kingdom, there are also people who photographed a full circle of rainbows, full circle rainbow grinding reputation is very rare to see, need to have the right conditions at the right time, so only pilots or skydiving enthusiasts at high altitude can see, there is a scientific basis to prove that all rainbows are round, but can not be seen on the ground. Therefore, the reason for the formation of a fully circular rainbow is the same as the reason for the formation of rainbows that we usually see.