Objectives (5 - 10 minutes)

1. Understand the phenomenon of Newton's rings: Students should be able to understand what Newton's rings are, how they are formed, and what physical phenomena are involved in their creation. This includes a discussion on light interference, refraction, and how these factors contribute to the formation of the rings.

2. Identify the practical applications of Newton's rings: Students should be able to recognize where the phenomenon of Newton's rings is observed in everyday life and in what contexts it is applied. This may include examples such as lens manufacturing, calibration of optical instruments, and even the observation of natural patterns like rainbows.

3. Apply the acquired knowledge to practical problems: Students should be able to use what they have learned about Newton's rings to solve practical and theoretical problems. This may involve analyzing an experiment, interpreting data, or solving equations that describe the phenomenon.

Secondary objectives:

• Develop observation and analysis skills: Through the study of Newton's rings, students will have the opportunity to enhance their observation and analysis skills. They will be encouraged to carefully observe phenomena, identify patterns, and formulate hypotheses.

• Promote curiosity and interest in physics: By exploring such an intriguing and seemingly magical phenomenon as Newton's rings, it is expected that students will develop a greater interest and curiosity in physics. This can lead to increased engagement with the subject and a greater motivation to learn.

Introduction (10 - 15 minutes)

1. Review of previous concepts (3 - 5 minutes): The teacher should start the lesson by quickly reviewing the concepts of optics and waves, focusing on refraction, interference, and diffraction of light. This review is essential to ensure that students have a solid foundation for understanding the phenomenon of Newton's rings. The teacher can ask students questions to assess their prior knowledge and identify any gaps that need to be filled.

2. Presentation of problem situations (3 - 5 minutes): Next, the teacher should present two problem situations that will serve as triggers for the Introduction of the topic. The first one could be the question: 'Why do we see colored rings when we look at a soap bubble?'. The second one could be an experiment involving a glass of water and a coin: 'What happens when you look at a coin through the water?'. The teacher should encourage students to think about these questions and formulate their own hypotheses.

3. Contextualization of the theme (2 - 3 minutes): The teacher should then contextualize the importance of studying Newton's rings, explaining that this phenomenon is present in various practical applications of everyday life. For example, the formation of the rings is essential in lens manufacturing, calibration of optical instruments, and even in the observation of natural patterns like rainbows.

4. Introduction to the topic (2 - 3 minutes): To draw students' attention to the topic, the teacher can share some curiosities or interesting facts. For example, they can mention that Newton's rings were discovered by the famous scientist Isaac Newton and that he spent a significant amount of time studying and writing about them. Another curiosity could be that Newton's rings can be seen not only in soap bubbles but also in other objects, such as lenses or even raindrops.

Development (20 - 25 minutes)

1. Theory (10 - 12 minutes): The teacher should start the theoretical part by explaining the phenomenon of Newton's rings. It should be clarified that the rings are formed due to the interference of light passing between two surfaces, one of which is convex (like a lens) and the other flat (like glass). Light is refracted as it passes through the lens and then undergoes interference when reflected on the flat surface. This results in a series of concentric rings of alternating colors.

   • The teacher should explain the concept of light interference, which occurs when two or more light waves meet. Depending on the phase difference between the waves, they can combine constructively (reinforcing the intensity of light) or destructively (decreasing the intensity of light).
   • The teacher should present the wave interference equation (2d sinθ = mλ), where d is the thickness of the air layer between the surfaces, θ is the angle of incidence of light, and m is an integer representing the order of the interference ring.
   • The teacher should explain that the refraction of light in the lens and the reflection on the flat surface result in a difference in optical path length, which leads to the formation of Newton's rings.

2. Demonstration (5 - 7 minutes): After the theoretical explanation, the teacher should perform a practical demonstration of the phenomenon. For this, they can use a set of lenses, a light source (such as a flashlight), and a piece of paper.

   • The teacher should place the convex lens on the paper and then the flat lens on the convex lens. Then, the light should be directed towards the convex lens.
   • Students should observe the Newton's rings that form on the paper between the lenses.
   • The teacher should explain each step of the process, highlighting how each element (light, lenses, reflection, and refraction) contributes to the formation of the rings.

3. Discussion (5 - 6 minutes): After the demonstration, the teacher should open up a space for discussion. Students should be encouraged to share their observations and ask questions. The teacher should clarify any doubts and reinforce key concepts.

4. Practical activity (if time allows): If there is time available, the teacher can propose a practical activity where students can create their own Newton's rings. For this, they can use a magnifying glass, a light source (such as a cell phone flashlight), and a piece of paper. Students should be guided to carefully observe the rings that form and try to explain the phenomenon based on what they learned in class.

Return (10 - 15 minutes)

1. Group discussion (5 - 7 minutes): The teacher should start a group discussion, where students have the opportunity to share their observations, questions, and conclusions after the practical activity. Each group should have a set time to present their findings and experiences. The teacher should encourage students to engage in the discussion by asking challenging questions and promoting a collaborative learning environment.

2. Connection with theory (3 - 5 minutes): After the group presentations, the teacher should make a connection between the practical activities and the theory discussed. It should be highlighted how the formation of Newton's rings is related to the concepts of light interference, refraction, and reflection. The teacher should reinforce the key points of the theory, clarify any misunderstandings, and answer any questions that may have arisen during the presentations.

3. Individual reflection (2 - 3 minutes): The teacher should propose a moment of individual reflection, where students have a minute to silently think about the answers to the following questions:

   1. What was the most important concept learned today?
   2. What questions have not been answered yet?

4. Sharing reflections (2 - 3 minutes): After the minute of reflection, the teacher should open the discussion for students to share their answers. Each student should have the opportunity to speak, if they wish. The teacher should listen attentively to the students' reflections, praise relevant answers, and provide constructive feedback when necessary.

5. Closing the lesson (1 - 2 minutes): To conclude the lesson, the teacher should summarize the main points discussed during the class, reinforce the learning objectives, and provide an overview of what will be covered in the next lesson. The teacher should remind students about the importance of studying Newton's rings and how they apply to the real world. Additionally, the teacher should encourage students to continue exploring the topic at home, if possible, and to bring any questions or observations to the next class.

Conclusion (5 - 7 minutes)

1. Summary and Recap (2 - 3 minutes): The teacher should start the Conclusion by briefly recapping the main points discussed during the class. This may include the definition of Newton's rings, how they are formed, the physical phenomena involved (interference, refraction, and reflection of light), and their practical applications. The teacher can reinforce these concepts with concrete examples and remind students of any important formulas or equations that were introduced.

2. Connection between Theory, Practice, and Applications (1 - 2 minutes): Next, the teacher should emphasize how the lesson connected theory (the physical concepts behind Newton's rings), practice (the demonstration of the phenomenon and the practical activity, if applicable), and applications (how Newton's rings are observed and used in various everyday situations and technologies). The teacher can illustrate this with specific examples and reinforce the importance of understanding the theory in order to apply it in practice.

3. Extra Materials (1 - 2 minutes): The teacher should then suggest some extra materials for students who wish to deepen their understanding of Newton's rings. This may include online videos, interactive simulations, articles, or reference books. The teacher should emphasize that these materials are optional but can be useful for consolidating learning and addressing any remaining questions.

4. Importance of the Topic (1 minute): Finally, the teacher should reinforce the importance of Newton's rings in everyday life, highlighting their applications in various areas such as lens manufacturing, calibration of optical instruments, and even the observation of natural patterns like rainbows. Additionally, the teacher can emphasize how studying this phenomenon can help develop valuable skills such as observation, analysis, and problem-solving, which are useful not only in physics but in many other areas of life.