Shadow common sense

1. What is a shadow? Light travels in a straight line, and the object in front of the light source blocks the light, and a dark area called a shadow is formed where the light cannot shine. The reason why we see this area is dark is because the light can't reach the back of the blocked object and can't be reflected into our eyes.

An object can cast shadows of different shapes. When the object is close to the light source, the shadow is larger because the object blocks a lot of light. As the object moves away from the light source, the shadow becomes smaller because the light blocked by the object decreases. If you rotate an object, you will get different shapes of shadows.

The edge of the shadow may be clear or blurred. When an object is close to a place where a shadow is cast, such as a wall, the edge is clearly visible. When the object is far away from the place where the shadow is cast, the edge will become blurred. Sometimes the middle part of the shadow is darker than the edge, the middle part is called umbra, and the brighter area is called penumbra. This shadow will appear when the light source is large. In order to make all parts of the shadow equally dark, the light source must be small.

The shadow outside depends on the weather. In sunny, cloudless and sunny weather in Wan Li, the shadows are clear and dark. When the weather is cloudy and gloomy, it is difficult to see the shadow, because the sunlight is scattered by the tiny particles in the cloud and emitted in many directions, which means that the shadow is brighter than usual, so it is not easy to see.

2. The application of shadows by human beings has been very useful to human beings since ancient times. The movement of shadow has its fixed pattern, so we can predict the size and position of shadow. When the earth rotates around its axis, everything on the earth's surface is illuminated by the sun. Mountains, trees and buildings all have shadows, but the position of shadows changes constantly throughout the day. As the position of the sun changes, the shadow moves from one side of the object to the other. In the early morning and evening, the sun in the sky is very low, and the shadows are very long at these times. At noon, the sun is high in the sky and the shadow is very short. The ancients found that the passage of time could be marked with a note, so they invented a sundial to let people know the local time.

3. The color of the shadow The color of the shadow depends on the light reflected by the shadow projection, and then the light blocked by the object is deducted. For example, a white wall reflects white light (in fact, white light contains various colors), so it looks white. When a part of the white light is blocked by an object, the light projected by the object on the wall becomes less, so the shadow part looks darker than the original wall.

If the object selectively blocks the light, the shadow will show different color changes instead of simple brightness changes. There are two possibilities as to how to selectively block the light. First of all, the object itself is selectively transparent (such as colored glass), so it will change the color of the shadow. Secondly, there are more than one light source and different colors. The object only covers part of the light source. For example, if two light sources, red light and green light, are installed in different positions in the environment, the same object will cast shadows of two different colors, red and green, because it is illuminated by both red light and green light, it will appear yellow.

2. What is the urgent function of shadow?

Shadow is equivalent to having two roles, each role is independent, and only counting coupons and points can be used together! The purpose of the shadow is that you can build another class at the same level as your main number, so as to save you the trouble of playing trumpet to upgrade your experience.

But after buying a movie, you still need a lot of things, such as slots, skills, training, props and so on! It is equivalent to dialing another number, and this is as good as your main number! Shadow rule of purchase: 1. Players need to log on to the purchase page, and there is enough balance in the account to purchase. 2. Players need to select a game area when purchasing. If there are no characters above level 25 (including level 25) in the game area, the purchase fails.

3. Players need to choose the occupation and gender of the "shadow role" when purchasing. 4. Players need to enter the role name of "Shadow Role" when purchasing.

The naming rule is "FSXXX" (prefixed with "FS" and suffixed with no more than three Chinese characters). 5. The "shadow character" has the same level as the character with the highest level in the area selected by the player. 6. Automatically get a skill slot (12 days) after the "shadow character" is generated. 7. The "shadow role" is permanent.

8. The price of the shadow package is 4800 coupons. Discount now, 3800 coupons! .

3.4 How to start from the shadow

We can only start with two kinds of shadows, namely shadow modulation and shadow modulation. Melody shadow is transformed from the rabbit ear horror box+rabbit ear transformation map in the pet transformation plan. Note: Box monsters are not necessarily level one.

Any level will do. And it has nothing to do with the number of d, not that the better the box, the better the shadow. Task reference: I 1 pet renovation in Flange City. Go to Flange City (195,67) to talk to Joseph first.

2. Then click BOSS in the following place, and you can find the bulletin board in Shandi's room. From there, you can enter Shandi's room, talk to Shandi in the room, and spend 1000G on the design? . At present, Shandi's rooms are distributed in the following places: 1, strange caves, down with reformed zombies, 2, caves of Dr. Dark, down with reformed cattle and ghosts, 3, black prayers, down with Ruby 4, Lorenz's research tower, down with Falcken 5, down with Arubas's caves, down with Dr. Dark Arubas, 6, fasting, down with Judas, 7, being.

When there is an unrecognized transformation map on your body, Josebe will tell you what the top map on your body is, so that you can also use the unrecognized transformation map for transformation. 3. Then return to Fran City with the confirmed design drawings and pets (195,67), talk to Josebe, give him the pet design drawings and the corresponding pets, and modify the pets.

Note: The following design schemes are the statistics of necessary items for transformation: the transformation of water spiders requires related design schemes ABC 1 Zombie; Need related design scheme ABCD 1 Water Spider (thanks to Leonara of Sichuan Tianhu for providing correct information) to transform green halitosis ghosts; Related design scheme ABCDE 1 needs green bad breath ghost to transform the shadow; Need the relevant design scheme of ABCDE. Rabbit ear horror box (any level) ensures that there is a plan to transform pets and is not open. There are plans to transform birdman ABCD 1 level birdman transforms hamster ABC 1 level hamster transforms flaming rat ABC 1 level flaming rat transforms ice pterodactyl ABCD 1 level ice pterodactyl transforms thief ABCDE card transforms melody shadow design, and changes after conversion: the default name is preceded by ".

After the transformation, the attributes and status of pets have changed. The reformed pet is not affected by the pet before the reform.

The skills that pets learned before transformation will be lost. Detailed abilities need to see 1 pet's ability table and growth record.

It should be noted that pets such as ice pterosaurs have not changed much even if they are transformed. The modified nickname is the default, so be careful when you put it on the ground.

The appearance and name of the rabbit ear scary box will change after the transformation, which needs attention.

4. Why do we have shadows?

Shadows are formed by objects in front of the screen blocking some light or something similar to the screen.

As long as under the light, all objects have shadows, such as water with good light transmittance, the shadows are relatively light, and those with poor light transmittance are very clear. Simply put, shadows are caused by light being blocked.

Say something more. I don't know why you ask this question. There won't be a ghost behind, is there a shadow? According to the above theory, ghosts have no shadow. The legendary ghost has no body, that is, no matter, only spirit, so it will not block the light.

But if you believe this is a physical problem, then you should believe all physicists' views: there is no spirit without matter.

Who can tell me something about shadows?

Shadow direction: firstly, we need to know the time from the bisector to the sun and the latitude of the direct point, secondly, we need to know the latitude position of the bamboo pole … finally, the time of the day … for example, now … for example, the bamboo pole is at north latitude 10 degrees … now we need to judge the shadow direction of the bamboo pole on the morning of April 26th. First, it is judged that the bamboo pole is between the equator and the Tropic of Cancer ... So from the vernal equinox to April 30th (the direct point of the sun moves every four days, and it just reaches the north latitude 10 on April 30th) ... On April 26th, the direct north latitude of the sun is 9 degrees south of the bamboo pole ... The morning light asks ... that is, the sun is in the southeast of the bamboo pole ... so the shadow faces southwest. (other latitudes … other dates, etc.)

Length: Generally, questions will test the shadow length at noon … First, calculate the height of the sun at noon … According to the bamboo pole length given in the topic … You can use tan in trigonometric function to calculate the shadow length …

About those special direct sunlight spots you mentioned, the analysis is the same as what I said above … I hope I can help you … I took the college entrance examination last year … hehe ~

I'm so tired … I'm sweating … I'm going to bed … I'm still in class tomorrow … Ask me if you don't understand anything … Jojo ~