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Anonymous users2024-02-11Q: Why is the rainbow arc-shaped in a rainy place instead of a large patch of color?
Answer: A rainbow is formed when the sun's rays enter the raindrops and are reflected off the inner surface of the raindrops. As soon as light enters from one medium, such as air, into another, such as water, it changes its path, which is called refraction.
The amount of bending in the path of light depends on the substance it passes through and the wavelength, which is the color of the light. So when sunlight enters a raindrop, the different rays it contains are bent differently: red is the smallest, purple is the largest.
Thus what emerges from the raindrops are a variety of colors, each with an arc of about 40 or 42 degrees. This happens with every drop of rain that is illuminated by the sun, but we can only see rainbows in certain raindrops, which have an arc of 40 to 42 degrees, which is exactly what transmits their rays to our eyes. These eligible raindrops form a circle, and part of it is often cut off by the horizon.
What remains above the horizon is what we call a beautiful rainbow.
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Anonymous users2024-02-10There is a lot of physics involved in this question.
It is very difficult to explain.
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Anonymous users2024-02-09We always compare the rainbow to an arched bridge, and we are full of secret thoughts about the mysterious rainbow. However, the rainbow does not have a bottom, because its whole picture is a complete ring. So why is it that the rainbow we look like is an online arc all the time?
The rainbow is an optical phenomenon in VientianeWhen the sunlight hits the water droplets in mid-air, the light is refracted and reflected, and the popular color spectrum of the arc changes in the sky, showing red, orange, yellow, green, blue, indigo, and purple pigments from the outside to the inner circle. In essence, there are hundreds of pigments in the rainbow, and according to them, there are subtle differences between the red and the apricot yellow, but for the sake of simplicity, only seven colors are used as groups.
First of all, briefly review the law of the transformation of the instantaneous rainbowThe small water droplets in the atmosphere after rain are like prisms, and after the incident of daylight, refraction occurs from time to time due to electrolyte changes, and then reflects and refracts in the water droplets. The refractive index of the different colors in sunlight is different, and it will be refracted when it is refracted and released. The sunlight shining on the earth can be approximated as parallel light, and the deflection of the spearhead will occur sequentially after incident from different positions of the water droplets, among which the refracted light with a critical angle of 40° 42° (from violet to red) to the incident light is the strongest, which is also the fixed fillet between your line of sight and the incident sunlight when you look at the rainbow.
Even if you change your perspective, the rainbow's position will move immediately, and the reason why you will never be able to chase the rainbow's end. The water droplets that meet this line of sight angle are all over the limit, not to mention without repeating an arc, but rather a ring (or cone).
Given that the daylight is higher than yours, the core of the rainbow ring repeatedly falls under the blockade, and you have to look at the smaller pair of the rings in general. At best, when the sun is just above the horizon, there is an opportunity to look at a half-ring rainbow in general. Therefore, in order to see the rainbow in its entirety, you have to have the view of Jehovah, climb to the mountains, or simply bliss.
If you are on an airplane, you will see that the rainbow will be a complete ring with a semicircle, and the main trunk of the coil rainbow is the orientation of the aircraft. ButIt is not easy to photograph the whole rainbow, the rainbow from one side to the other, 84 degrees. With a similar 35mm camera, a slow motion with a pitch of 19mm or less is required to capture the entire rainbow in a single frame.
The Earth is a sphere, but due to gravity, it is not a perfect sphere, and the equator bulges outwards to form a "spare tire" structure. In fact, the polar radius of the Earth is kilometers, while the radius of the equator is kilometers.
To answer this question, we must first introduce the phenomenon of gravitational force. Physicist Isaac Newton discovered that all matter has a mutual attraction called gravitational or gravitational force. This attraction has a simple relationship with the mass and distance of the substance >>>More
It's like a snowball, the dust in the universe is like snow, getting bigger and bigger, and the more round it gets.
The earth is round because the angle you observe is from the cosmic angle of the earth, and the size of the earth is also macroscopic size, and you see the earth from a large-scale perspective. Take basketball as an example, if its surface is less than a millimeter, it is also flat.