Reflection on the reflection of light

Part 1: Reflection on the reflection of light

"Reflection of Light" is one of the key contents of the optical part of physics textbook. The law of reflection of light is another important optical law after the law of linear propagation of light. The reflection of light also has important application in daily life. Therefore, how Taking this class well, what effect this class can achieve plays a crucial role in subsequent learning.
"Physics Teaching Book" puts forward detailed requirements for the teaching of this lesson from three aspects: knowledge and skills, process and method, emotional attitude and values. These requirements seem simple but it is not easy to actually complete them. I usually think that the textbooks are very familiar in class, and I often spend a lot of time when preparing lessons.
The preparation and improvement of the experimental equipment for the student experiments in the classroom also really cost me a lot of thought. The beam effect of the laser in the experiment was not obvious, so I thought of making smoke with incense; the smoke needs to be collected and preserved, so I thought of the empty box, and the local box was used to invert the empty box of the light reflection demonstrator in the laboratory. Just because of the angle problem, I thought of putting a self-drawn protractor on the back of the box, and the position of the self-made protractor was repeatedly changed several times.
The effect of this lesson is very good, and students have learned the knowledge easily. I was also moved to reflect on myself. In the inquiry experiment, the relationship between the incident angle and the reflection angle was not explored. The corresponding table was not designed. It was only for the students to compare it roughly. Even some students simply made an experiment and reached the conclusion easily. Sex is not strong, this is easy to see in the students' homework. The three specular and diffuse reflections are just a brief introduction, and no detailed light path diagram is shown to explain. Did not allow students to establish a clear concept in their minds. The four aspects of the classroom are inconsistent, and the preparation of lessons is not perfect, but only on the surface. Five did not take into account the students' knowledge level and acceptability, and did not consider all kinds of problems that may arise in the classroom. Sixth, there is no blackboard design, it is easy to cause the board to be messy and unorganized during the lecture.
In the future teaching, I should try to do the following:
First, fully prepare, prepare lessons: prepare teaching materials, prepare teaching methods, prepare students. Take full account of the possible situation in the classroom and make a response.
Second, there are teaching plans in the heart, but do not focus on teaching cases, focus on the things generated in the classroom, improve their ability to respond to the classroom, and strive to make classroom teaching an art.

Part 2: Reflection on the reflection of light

"Reflection of Light" is the content of the fifth grade of the National Science. The lesson of Light Reflection is a continuation of the previous lesson. It is also the study of the spread of light. The difference is that this lesson is a study of how light encounters obstacles in the course of its transmission. For this lesson, I have positioned its teaching objectives as: Scientific concept: When the light hits the mirror, it changes the direction of the propagation and is reflected back to form a reflection phenomenon. The reflected light also travels in a straight line. Many useful instruments have been invented using the principle of light reflection. Process and method: Follow the instructions to perform the experimental operation correctly. Learn to draw light routes. Emotions, Attitudes, and Values: Understanding changes in natural things is regular. People who master the laws of nature can produce and live better. Teaching focus: Recognize the reflection and use of light. Difficulties in teaching: master the route of light.
For the activities that illuminate the three goals, the students are happy to participate in the game. The first activity is to illuminate the book with a flashlight. The second activity is to set up the book and let the students think about how to illuminate the book. The third activity increased the difficulty, let the students use the flashlight to illuminate the rubber behind the book. I didn't say much, let the students experiment on their own, find ways to solve the problem, and let the students choose the experimental materials. Through the students' exploration, they will find that with two mirrors, after two reflections of light, the ball can be illuminated. By illuminating the three activities of the ball, the student already knows that this is the principle of using the reflection of light, but the concept of the reflection of light is not deep enough, and the route of light propagation is not necessarily known, so The conceptual explanation is a necessary guide to the careful transmission of the light. Students must be aware that the propagation of light is straight, and the reflected and incident light cannot be separated. It is generally understood that the angle of reflection and the angle of incidence are the same.
After the three activities are over, after the light reflection and the propagation route in the process of light reflection are consolidated, we will show them through the examples in life, so that students can better understand the principle of light reflection. Through the forehead mirror and the car rearview mirror, by looking at the comparison of the classroom walls, through the observation of the fluorescent lampshade, students can understand the application of light reflection principle to production and life.
Through these links, the students have mastered the principle of light reflection and the propagation route of light, and mastered the application of the principle of light reflection in production and life. There are still many shortcomings in this class. For example, the route of light can also allow students to draw more in their own draft paper and then feedback. Instead of having individual students come to the stage to demonstrate, then explain, and finally draw on the textbook. For the first two experiments imported from the game, you can also let the students try it for themselves, not necessarily for individual students to do it. This shows that the teacher's thinking can not be combined with the theoretical study, which leads to the superficial thinking. I also reminded me to further study and combine my thinking with the theory of advocacy to achieve an improvement in my understanding of the theory and thus improve my teaching level.

Part 3: Reflection on the reflection of light

This class was not good at the first time on the fifth day. Because the old textbooks have this content, they are somewhat careless when preparing lessons, and they are not very detailed. It is definitely not very careful about the new textbook. In fact, a set of experiments on the textbooks is not available before. It is very easy to look at the pictures. I even think that there are many links and experiments in this "illuminating objects". So did not carefully read the textbook process. As a result, during the class, students took a look at the experimental requirements on the textbook and found that the three experiments were progressive. From the first to directly illuminate the book, to the second to use a mirror to illuminate, to the third to use two mirrors to illuminate the ball in the shadow of the book, the difficulty is gradually strengthened. But there is no analysis on the teachings, only one sentence: this experiment is not a simple repetition, it is a progressive relationship. It is now found that this link is a clever part of the new textbook. It is best to do it one by one, but influenced by the factors of students playing with equipment, I usually put the three experiments together and found that the third experiment is a bit difficult. It is difficult for students to do it all at once. After completing the first two simple experiments, explain the scientific concept of what is the reflection of light. The last two-reflex experiment can be used as an in-depth exploration.
But the five classes on the day, because of my lack of estimation, wasted some time on the experiment. Also because of the sticking to the old textbooks, I feel that the relationship between reflection and color should also be talked about, so that students can do reflective experiments of various colors, so that the key scientific concepts of "reflex" are not well understood, and students may not be deeply impressed. In the next discussion of the use of reflection, the light of the car mirror is not very light, the doctor's forehead light will not be painted, or the concept of incident and reflected light is unclear. Because time is too late to talk about it, I painted it on the blackboard and let the students follow it. I don’t think it makes much sense.
There is no time to talk about the periscope behind, and there is no time for the students to look at the model. There is no way to observe the function of controlling the light in the pupil of the eye, let alone extend the content to the extracurricular, and let the students go back to do kaleidoscope and other content.
In short, today's preparations and estimates are not enough, so that the content and teaching objectives of the classroom are not completed satisfactorily. I feel very embarrassed to the students, and I will remedy the next lesson. The other classes have not yet been put up, and the lessons have been revised. It is necessary to presuppose the content and steps, and strive to make the students gain more.

Part 4: Reflection on the reflection of light

When I used to reflect "light reflection", I now draw "normal" on white paper, and then the teacher demonstrates that the incident light is directed at the plane mirror. The plane mirror reflects the incident light, and students can easily get the law of light reflection, which can save A lot of time for intensive training, the effect may be better from the perspective of knowledge, but it is not conducive to the cultivation of students' ability. Students only passively accept learning, the enthusiasm for learning is not high, and the classroom atmosphere is not active.
After adopting the “inquiry” teaching, students are encouraged to create a problem of light reflection, which stimulates students' interest in learning. From guessing, designing experiments, conducting experiments, analyzing experimental data, conclusions are all completed by students, and students' enthusiasm is special. Soaring, and through the exploration of the law of reflection of light, I learned a thinking program to study the problem, and then I will know how to explore it when I encounter problems.
Below I introduce the novel exploration methods that appear in this section of the student inquiry.
The physics class of the three classes I taught was to do this class. During the experiment, most of the students prepared their own equipment, and then gradually completed the experiment according to the inquiry steps in the book. The reflection experiment of light in this section is done by placing the plane mirror on the table, connecting the two pieces of cardboard, placing them vertically on the plane mirror, and a beam of light on the plane mirror at an angle to the plane. The reflection of the plane mirror is emitted in the other direction, and the track of the incident light and the reflected light is traced on the cardboard. Remove the cardboard and measure the angle of incidence and angle of reflection with a protractor. However, when drawing the track of light, because the paper is placed vertically, there is no dependence, the skew of the drawn line affects the measurement of the angle, and the error is larger. When the students experiment, they come up with a novel approach: The white paper is placed on the tabletop, the plane mirror is placed vertically on the white paper, the plane mirror is harder, and the control is better. Then, a laser beam is used to smear a piece of light on the white paper, and the light is reflected to the plane mirror, and the light reflected by the plane mirror is emitted along the paper surface. , use the scale and stroke to draw the light track. The light is straight, not skewed, and the angle of incidence is measured by the angler, and the error is greatly reduced. After seeing the classmate’s novel approach, I praised him in front of the class and gave a positive confirmation of this practice.
The student's grades are of medium level. After this experience, he has a strong interest in physics experiments. Every time he does experiments, he is the first to complete, the conclusions are more accurate, and the physics subjects are improved. It is also very fast, and his self-confidence in learning has also increased.
After completing this inquiry, I deeply realized that the real purpose of teaching is to let students acquire the method of research thinking through the exploration of knowledge, and then explore the process of creation through the acquisition and application of methods, so that students can love nature and nature. The emotion of harmonious coexistence has the scientific spirit of being willing to explore natural phenomena and the principles of physics in daily life.

Part V: Reflection on the reflection of light

In the lesson on how light spreads, the characteristics of light propagation are studied. The lesson of Light Reflection is a continuation of the previous lesson. It is also the study of the spread of light. The difference is that this lesson is research. What happens when light hits an obstacle during the journey. There are two aspects to this lesson. One is to recognize the reflection of light by illuminating the object, and the other is to recognize the reflection of light in life.
There are many deficiencies in the teaching process that need to be improved. 1. I am not careful about the study of teaching materials and teaching materials. I need to focus on this in the future. There is no serious thinking about the activity of illuminating objects in textbooks. There is a saying in the textbook: These three activities are not simple repetitions, but gradually increase the difficulty, progressively, so that students have an interest in constant challenges. . The first activity directly illuminates the book, the second uses the mirror to illuminate the book, and the third uses two mirrors to illuminate the small ball in the shadow. The difficulty is gradually strengthened and the relationship is progressive. When I was preparing for the lesson, I didn't notice this. I didn't think about why, but it caused errors in the teaching and needed to be corrected in the later classes. In teaching, the direction of light propagation is not emphasized, which leads to the direction in which students draw the wrong light when applying the reflection of light. 2. When the concept of light reflection is proposed, it is only forcibly presented, telling students the concept of light reflection, and should summarize the concept of light reflection according to the activity just now. 3. When teaching the application of light in life, you should not immediately show the reflection of light in the picture applied in life, let the students talk about the reflection of the light that they know. Then supplement and give a brief explanation based on the student's speech. 4, the board is too simple. In this lesson, there are many light roadmaps that can be used to emphasize the route and direction of light through the way of the blackboard, which is very helpful for students to master the newly acquired knowledge. 5. When the size of the pupil is changed, there is no attention to emphasize that the glare cannot be directed at the eyes. It is dangerous to do so. 6. The reflection of light in the application of science and technology, measuring the distance between the earth and the moon, it is necessary to focus on the explanation, how the measurement is carried out, how to calculate the distance between the earth and the moon. I was simply taking it when I was teaching, and many students still didn't understand the mystery. 7. Throughout the class, my teaching time is too long. Students can only listen to the lectures, so that the initiative of students' learning is not mobilized. The students think less, but passively accept. 8, the language in the class is not vivid enough.