Why is there a rainbow when it rains? Writing essay

1. Why is there a rainbow after rain? 300-word essay

After the summer rain, the dark clouds disperse and the sun shows its face again, and we can often see beautiful rainbows.

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Rainbows are very beautiful, but I don’t know where they come from. Rainbows appear after rain. Why is it said, “How can you see a rainbow after a storm?”

I found out after searching for information. , it turns out that when sunlight passes through a prism, its forward direction will be deflected, and the original white light will be decomposed into seven colors of light bands: red, yellow, blue, indigo, orange, indigo, and violet.

When it rains , or after a rain, the air is filled with countless small prisms - water droplets. When the sunlight passes through the water droplets, it not only changes its direction, but is also decomposed into red, yellow, blue, indigo, orange, indigo and purple. If the angle of each color of light is appropriate, it will become the rainbow we see.

The larger the raindrops in the air, the brighter the colors or the width of the rainbow. If the water droplets are larger in the air, then the color of the rainbow will be Just bright, if the water droplets are small (like fog droplets), the rainbow color will be lighter, but wider, wider than the bright colors.

The rainbow is a part of the atmosphere. A kind of omen, its occurrence is related to the weather at that time. Generally, when a rainbow appears, it can be inferred whether it will be sunny or rainy at that time. (from Baidu) 2. An essay on why rainbows appear after rain

In the early morning, the sky was very overcast, and the sky was filled with dark clouds, pressing down heavily. Pedestrians on the street walked very slowly, and it seemed that everyone was suffocated by the dark clouds. At this moment, huge raindrops poured down, and the soil on the ground was also stirred up by the raindrops. The air was filled with a heavy smell of soil. Pedestrians on the street were hiding everywhere, and there were people hiding in front of the shops. Rain people. After a while, heavy rain washed the town completely.

The rain gradually stopped, and people seemed to have not gotten rid of their heavy hearts, walking on the road casually. Suddenly, a ray of sunlight shines directly through the clouds, illuminating the green mountains in the distance. The sky gradually clears up, and a rainbow hangs quietly on the horizon, spanning the green mountains in the distance. The dazzling color is set against the green mountains. It looks particularly fresh, like a fairyland on earth. At this time, the pedestrians on the street slowly stopped, looking at the rainbow in the sky, talking and laughing, as if the rainbow brought them hope. The seven-color rainbow composed of "red, orange, yellow, green, green, indigo and purple" seems to represent the bitter, spicy, sour and sweet life, and everyone seems to be savoring it carefully. Listen to the old man saying: There are two beautiful Tianchi on both sides of the rainbow, and the fairies in the sky travel between the two beautiful Tianchi through this rainbow bridge. Perhaps it is this rainbow bridge that connects two beautiful things, causing people to have endless reverie, and making everyone who sees it full of hope.

The sky gradually became clearer, and the warm sunshine shone on the whole town. The rainbow slowly disappeared, and the pace of pedestrians on the street also quickened. Everyone was infected by the rainbow after the rain. , with a rainbow-like smile on his face

After the storm, everything calmed down. After the dark clouds dissipated, the sky was still bright and everything took on a new look. A beautiful rainbow was erected, like a successful building. The bridge makes my heart happy. The rainbow is always in the blue sky after the wind and rain, just like my sky.

When I was a child, I developed a strong interest in painting. When I was in elementary school, art class was my only expectation every day. Finally, one time, the art teacher said: "This time, our school is going to hold an art exhibition, and we ask the students to take out the paintings they think are beautiful and participate in the competition." "Oh!" The students cheered, and each painting went to the competition. The teacher handed it to me, and of course I scrambled to take out the painting I thought was the best and handed it over. A pair of colorful paintings attracted the teacher's eyes. I raised my head and looked at the teacher expectantly, but what was waiting for me was just my endless tears, and my painting was eliminated

Looking at the painting, tears filled my eyes again. Finally, big drops of tears fell on the painting and penetrated the paper. Why? Why? My clear blue sky was overshadowed by dark clouds and it started to rain. 3. The composition about the rainbow is mainly about the rainbow appearing in the sky after the rain, so that I can think of why

The rainbow after the rain

My mother often said to me: "The rainbow after the rain." Rainbows are the most beautiful. "So every time I look forward to a heavy rain, but I delay this precious scene because of school. This time I finally waited for this day, and the sky became extra blue after being washed by the heavy rain. ah! The rainbow finally appears.

Rainbow turns out to be so beautiful. He seems to be very naughty and deliberately avoiding me. As long as I take a step forward, he will take a step back. He is arc-shaped, looming and hiding at the end of the blue sky. Looking at this beautiful rainbow, I can’t help but wonder: is that gorgeous rainbow the pearls sprinkled by fairies? ······

The rainbow is very beautiful, why is it? Because of its color. There are 7 colors in the rainbow: red, orange, yellow, green, cyan, indigo, and purple.

If you stand on the peak and watch, you will see the beautiful scenery set off by the brilliant rainbow. This sacred scene is like a fairyland, and you will be intoxicated by it.

The rainbow is like a fairy's ribbon, fluttering and soft; this rainbow is like a successful bridge, connecting successful people to victory.

Ah! I think the rainbow is the most beautiful. It is not only a rainbow, but also a goal that inspires me to study and work hard. I want to "go higher and higher" like it.

Is that possible? Give some points. 4. Why does a rainbow appear after a rain? 450-word essay. Please help, dear~

After the rain in summer, when the dark clouds disperse and the sun shows its face again, we can often see beautiful rainbows.

Rainbows are very beautiful, but I don’t know where they come from. Rainbows appear after rain. Why is it said, “How can you see a rainbow after a storm?” After searching for information, I found out that it turns out that the sun passes through When using a prism, the forward direction will be deflected, and the original white light will be decomposed into light bands of seven colors: red, yellow, blue, indigo, orange, indigo, and violet. When it rains, or after it rains, the air is filled with countless small prisms - water droplets.

When sunlight passes through water droplets, it not only changes its direction, but is also decomposed into seven colors of light: red, yellow, blue, indigo, orange, indigo, and violet. If the angle is right, it becomes what we see. Arrived rainbow. The amount of raindrops in the air determines the brightness or width of the rainbow.

If the water droplets in the air are large, the rainbow will be brightly colored. If the water droplets are small (like fog droplets), the rainbow will be lighter in color but wider than the brightly colored ones. A rainbow is a sign in the atmosphere. Its appearance is related to the weather at that time. Generally, when a rainbow appears, it can be estimated whether it will be sunny or rainy at that time. 5. Why is there a rainbow after rain?

Rainbow is an optical phenomenon in meteorology. When sunlight hits raindrops in mid-air, the light is refracted and reflected, forming an arched, colorful spectrum in the sky. The seven colors of the rainbow, from outside to inside, are: red, orange, yellow, green, cyan, indigo, and purple.

A rainbow is caused by sunlight hitting small, nearly round water droplets in the sky, causing dispersion and reflection. When sunlight hits a water droplet, it will be incident at different angles at the same time, and will also be reflected at different angles within the water droplet. Among them, the reflection between 40 and 42 degrees is the strongest, causing the rainbow we see. When this reflection is caused, sunlight enters the water droplet, is refracted once, then reflects on the back of the water droplet, and finally refracts again when leaving the water droplet. Because water has a dispersive effect on light, the refractive index of light of different wavelengths is different. The refraction angle of blue light is larger than that of red light. Because light is reflected within the water droplets, the spectrum seen by the observer is inverted, with red light at the top and other colors at the bottom.

In fact, as long as there are water droplets in the air and sunlight is shining behind the observer at a low angle, an observable rainbow phenomenon may occur. Rainbows most often appear in the afternoon, just after rain and when the weather turns sunny. At this time, the air is less dusty and full of small water droplets, and one side of the sky is darker because there are still rain clouds. There are no clouds above or behind the observer and sunlight is visible, making the rainbow easier to see. Another place where rainbows are often seen is near waterfalls. On a sunny day, you can also create an artificial rainbow by sprinkling water or mist in the air with your back to the sun.

The size of water droplets in the air determines the brightness and width of the rainbow. The larger the water droplets in the air are, the brighter the rainbow will be. It is also relatively narrow; conversely, when the water droplets are small, the rainbow color is lighter and wider. We cannot see rainbows when we face the sun, but we can only see rainbows when we turn our backs on the sun. Therefore, the rainbow in the morning always appears in the west, and the rainbow in the evening always appears in the east. But we can't see it. We can only see it by looking down from a high altitude on a plane. The appearance of the rainbow is related to changes in the weather at that time. Generally, we can predict whether it will be sunny or rainy from the position of the rainbow in the sky. When a rainbow appears in the east, it is less likely to rain locally, but when a rainbow appears in the west, it is more likely to rain locally.

The visibility of the rainbow depends on the size of the water droplets in the air. The larger the water droplets are, the brighter the rainbow will be. The smaller the water droplets will be, the less obvious the rainbow will be. Generally, the temperature in winter is lower, there are less water droplets in the air, and there are less chances of rain showers, so rainbows generally do not appear in winter.

The optical principle that causes rainbows often causes two rainbows to appear at the same time. A concentric but darker secondary rainbow (also called a rainbow) appears outside the ordinary rainbow. A secondary rainbow is formed by two reflections of sunlight in water droplets. The strongest reflection angle of the two reflections occurs between 50° and 53°, so the position of the secondary rainbow is outside the main rainbow. Because there are two reflections, the color order of the secondary rainbow is reversed from that of the primary rainbow, with blue on the outside and red on the inside. The secondary rainbow must actually follow the main rainbow, but because its light intensity is lower, it is sometimes not noticed by the naked eye. Double rainbow over Scotland In 1307, some people in Europe suggested that rainbows were caused by the refraction and reflection of sunlight by water droplets. Descartes discovered in 1637 that the size of a water droplet did not affect the refraction of light.

He conducted experiments by injecting water into a glass ball and obtained the refractive index of water to light. He used mathematics to prove that the main rainbow is caused by reflection within the water point, while the secondary rainbow is caused by two reflections. He accurately calculated the angle of the rainbow, but failed to explain its colors. Later, after Newton used a glass prism to demonstrate that sunlight was scattered into colors, all the optical principles for the formation of rainbows were discovered.

sssssssss 6. Third grade composition "Why does the rainbow appear after the rain"

After the summer rain, the dark clouds disperse and the sun shows its face again, and we can often see beautiful rainbows.

Rainbows are very beautiful, but I don’t know where they come from. Rainbows appear after rain. Why is it said, “How can we see a rainbow after a storm?”

I searched for information. Only then did I discover that when sunlight passes through a prism, its forward direction will be deflected, and the original white light will be decomposed into light bands of seven colors: red, yellow, blue, indigo, orange, indigo, and violet.

Below When it rains, or after it rains, the air is filled with countless small prisms - water droplets. When the sunlight passes through the water droplets, it not only changes its direction, but is also decomposed into red, yellow, blue, indigo, orange, indigo, The seven colors of purple light, if the angle is right, will become the rainbow we see.

The larger the raindrops in the air, the brighter the colors or the width of the rainbow. If the water droplets are larger in the air, then Rainbow colors are bright. If the water droplets are small (like fog droplets), the rainbow color will be lighter and wider, wider than the bright colors.

A rainbow is a sign in the atmosphere. It The appearance is related to the weather at that time. Generally, when a rainbow appears, it can be inferred whether it will be sunny or rainy at that time. 7. Is there really a rainbow after the rain?

Whenever it rains, a beautiful streak may appear in the sky. rainbow.

But, will there definitely be a rainbow in the sky after the rain? The rainbow is beautiful, but who knows the bitterness and struggle before the rain! Who can guess how long it takes to prepare for the rain! The Chinese teacher asked us to teach 13 lessons - "Suzhou Gardens" by ourselves. The teacher got me, and I danced for joy.

After I went back, I prepared for a long time. First, I looked up pictures of Suzhou gardens online and in books.

Then, phonetically explain the new words in the text; read the text three times and draw a diagram. Then, according to the Chinese teaching aid, I divided the article into paragraphs and summarized the main ideas of the paragraphs.

Finally, I listed what I wanted to talk about in a certain order to avoid being nervous and forgetting some content during the lecture. Today, I stand on this sacred platform and listen to my classmates shouting: "Hello, teacher!" I can't help but feel a little embarrassed! I calmed myself down, stood up straight, asked the students to read the introduction to the text first, and then started teaching.

However, the Chinese teacher was sick and did not come; the head teacher went to deal with a classmate's affairs and did not come. As a result, some naughty classmates ignored my presence and walked around.

I was furious, so the monitor went to deal with it. Woohoo...! This was my first failure as a teacher.

But I still didn’t get discouraged or give up, so I continued talking. Although most of my classmates supported me, I was still a little sad.

When I finished writing on the blackboard and waited for the students to finish copying, I erased it with a blackboard eraser. However, something even more sad happened.

A few naughty classmates shouted: "I haven't finished copying yet! What are you doing after wiping it off!" I was at a loss. At this time, Li Haolin, who was sitting in the first row (you will know who he is after watching "The Chaplin Twins") said to me softly: "They are deliberately causing trouble, just ignore them."

The squad leader also got up and enforced discipline. After I regained my composure, I started teaching again. Of course, there was a lot less ***, but I was still teaching hard.

get out of class is over. Not in a good mood.

Because my efforts are not recognized by everyone. Although I know that is absolutely impossible.

However, I still hope to get everyone's approval. There is not always a rainbow after the rain, but there is definitely sunshine after the rain! CHUANFUYI,eon!. 8. There is always a rainbow after the rain Composition

The sun always comes after the storm, please believe there is a rainbow! ——Inscription: Thinking of the song "Sunshine is always after the storm", my heart can't help but tremble. Looking back on the past, I can see how many successes and failures there were.

In the face of success, we are happy; in the face of failure, we may be at a loss; we may be depressed; and we may make a comeback... People often cannot face failure and tend to be at a loss. , often become depressed, and those who make a comeback may become celebrities.

Faced with setbacks, Gong Zizhen saw the fallen flowers all over the ground. Instead of feeling sad, she chanted loudly: "Falling red flowers are not heartless things, they turn into spring mud to protect the flowers." Su Shi was not sad when he saw the late spring scene. Instead, he wrote a beautiful sentence: "There are many willows blowing on the branches, and there are no fragrant grasses anywhere in the world"; Bai Juyi recalled the beautiful scenery of Jiangnan, and did not lament for leaving Jiangnan, but left to future generations "The sun rises over the river". The beautiful poems of "The flowers are as red as the flowers, and the rivers are as green as blue when spring comes"... They have all been frustrated in officialdom, and they have all been disappointed and wandering, but they all understand that "limestone can only come out of the mountain after thousands of tempers; rainbows can only be more beautiful after being baptized by wind and rain; People will become stronger after overcoming setbacks! "We may not be as beautiful as the sunset, nor as clear as flowing water, but we can be as pure and transparent as crystal; we are not as free and easy as the sea, and there is no waterfall-like waterfall, but we can be. It is as simple and easy-going as soil; it is not as towering as a mountain, and it is not as soft as a lake, but it can be as firm and steady as a rock.

We also need to realize that a sail without wind will not be full, a person without pressure will not be able to go far, and setbacks are inevitable in life. Let us cheer up, treat pressure correctly, treat setbacks correctly, spend every day seriously, use persistence to water the flower of life, and let it grow strong! Life is like a filter.

It carefully selects strong men who dare to face reality and conquer difficulties and make them people that attract the world's attention; it ruthlessly eliminates those timid cowards, who are mediocre people who do nothing. Eighteen-year-old In the Mood for Love, eighteen-year-old song.

The eighteen-year-old sings to the high sky, and lets the melody fly with the eagle; the eighteen-year-old sings to the surging sea, and lets the notes swim with the giant whale; the eighteen-year-old sings to the vast earth, Let the rhythm follow the galloping horse. *** The unrestrained eighteen-year-old does not demand eternal happiness, but only wants to have a real life.

Eighteen-year-olds who are not afraid of falling should let their lives be imprinted with the footprints of maturity, sing in harmony with the passage of time, and let youthful wisdom embellish the intoxicating splendor. Aspiring eighteen-year-olds, you should know that rainbows will become more beautiful and moving only when they experience wind and rain; trees will become taller and straighter only when they experience wind and rain; and people will become stronger only when they experience setbacks! There are many wrong paths in life, but the wrong path may not be the end. Please believe that the rainbow after the rain is more beautiful. 9. Why does a rainbow appear in the sky? 400-word essay

After the summer rain, the dark clouds disperse and the sun shows its face again, and we can often see beautiful rainbows.

Rainbows are very beautiful, but I don’t know where they come from. Rainbows appear after rain. Why is it said, “How can you see a rainbow after a violent storm?” After searching for information, I found out that it turns out that the sun passes through When a prism is used, the forward direction will be deflected and the original white light will be decomposed into light bands of seven colors: red, yellow, blue, indigo, orange, indigo, and violet. When it rains, or after it rains, the air is filled with countless tiny prisms - water droplets.

When sunlight passes through water droplets, it not only changes its direction, but is also decomposed into seven colors of light: red, yellow, blue, indigo, orange, indigo, and violet. If the angle is right, it becomes what we see. Arrived rainbow. The amount of raindrops in the air determines the brightness or width of the rainbow.

If the water droplets in the air are large, the rainbow will be brightly colored. If the water droplets are small (like fog droplets), the rainbow will be lighter in color but wider than the brightly colored ones. A rainbow is a sign in the atmosphere. Its appearance is related to the weather at that time. Generally, when a rainbow appears, it can be estimated whether it will be sunny or rainy at that time. 10. Observe why there is a rainbow after the rain 50 composition

After the rain, there will be her! She is colorful, she is dazzling, and she is a symbol of beauty in people's hearts.

From "tick tock, tick tock——" to "clatter——". The rain is getting heavier and heavier. I don’t know why. All the good impressions of rain in the past have been washed away by these raindrops that wet my clothes. As the water flows slowly forward, it is constantly trampled by people’s footsteps and splashes of black Splash! I hate the rain, and the umbrella cannot cover its attack. There are puddles under my feet, and the splashes wet the corners of my trousers. The rain brings the wind and grabs my umbrella, making me struggle to pull it toward me. Go forward.

The fine raindrops blocked my sight, making the scenery in front of me blurry and blurry, making me feel that the road ahead was endless and so vague. I sighed, I was sad, and the dark sky cast a dark cloud over my heart, making me almost suffocated.

In an instant, it was like a colorful meteor streaking across the sky, leaving a faint color. Like a fairy's sleeves waving across the sky, resting on the clouds on the horizon.

Like a garland woven with delicate flowers, dotted with blue dresses. She is hope, she is light, she is the source of warmth in my heart.

She is composed of seven colors. These seven colors are connected and harmonious. The color combination is just right, like a raindrop falling on her body, blending the colors together, soft and perfect. This is the color palette. The colors are unmatched! She is not the most beautiful, but she occupies an irreplaceable position in people's hearts. Her colors are not the most vivid, but they can make people indulge in them.

She does not meet people the most, but she can be remembered in their hearts.

Because she makes people feel happy after the rain, because she makes people feel warm after the rain.

After the rain, in the moist breeze, it is a beautiful enjoyment to look up at the arc-shaped colorful bridge in the sky. Life is like a dream, it goes by in a flash, the road of life is bumpy, you will encounter setbacks and failures.

But don’t forget: after the rain, there will be a rainbow.