A Detailed Lesson Plan in SCIENCE 8 Content Standards: The learners demonstrate an understanding of some properties and characteristics of visible light. Performance Standards: The learners shall be able to discuss phenomena such as blue sky, rainbow, and red sunset using the concept of wavelength and frequency of visible light. Learning Competency: Demonstrate the existence of the color components of visible light using prism or diffraction grating. I. Specific Objectives: At the end of 60 minutes discussion, the learners should be able to: Describe properties and characteristics of light. Explain the occurrence of spectacular events in the sky like rainbows, red sunset and blue sky. Infer that white light is made up of different colors. II. Subject Matter A. Topic: Properties and Characteristics of Light B. Materials: Ppt presentation, Laptop, Paper, Manila paper, pentel pen C. References: Science learners module pp 91-99, Science Teachers Guide pp 57-60, www. Youtube.com/ refraction of light, www. Physics classroom.com D. Values: Compassion, Kindness, and Courageous III. Procedure Teacher’s Activity A. Preliminaries Good morning, Class! I am Ms. Erica Encarnada, and I will be your science teacher for this morning. So, before we start our class, kindly stand up and let us pray (Mention the name of the students, who will lead the prayer) Again, good morning Everyone! Before you take your seat, kindly pick up some papers in front of you or under your chair, and throw it in Student’s Activity Good morning, ma’am! (Stand and bow their head) Yes ma’am! (Prayer) Good morning ma’am Encarnada, Good morning classmates! the garbage can. (Picking some papers) Let me check the attendance before we start with our class discussion. (Checking the attendance) (Raising their hands) Very good class we have no absentees today. Before we start, here are a few reminders that you need to keep in mind throughout the discussion. - Focus on the discussion when the teacher discusses. - Raise your hand, when you want to answer. - Take note important ideas. B. Elicit During our last meeting, we have discussed the characteristics and properties of sound. What are the characteristics and properties of sound? Very good, Any other answers? Very well said! Very good class! Your answers are all correct. C. Engage Let us now move on to our new lesson. Properties and Characteristics of Light I have here the picture What do you saw in the picture? A boy Yes very good! A boy What is the name of the boy? Who can answer? Roy G. Biv Yes the name of the boy is Roy G. Biv Are you familiar with that name? (Answers of students may vary) What do you think, is there a connection between the character and the lesson? (Answers of students may vary) Who can guess some information or concept from the name of the character? Anyone? I think ma’am, its about the color of the rainbow Yes, very good! Any answer? . Maam roygbiv it’s the Precisely! Why do we see spectacular events in the sky like rainbows, red sunset and blue sky? Yes very good! Because of the sunlight that is scattered by molecules in the atmosphere. The color we see in the sky come from the sunlight that is scattered by molecules in the atmosphere. This process called Rayliegh scattering. Nitrogen and oxygen make up most of the molecules in our atmosphere, but any gas or aerosol suspended in the air will scatter rays of sunlight into separate wavelengths of light. How are refraction and dispersion demonstrated in light? Who can answer? Yes very good! Among the colors of light, which bent the most? Anyone? Violet light is bent the most Yes very good! Since violet light has a shorter wavelength, it is slowed more than the longer wavelengths of red light. Consequently, violet light is bent the most while red is bent the least. This seperation of white light into its individual colors is known as dispersion of light. D. Explore I have here the group the activity. Please group yourselves into three (3) groups! Okay, group 1please proceed here in the right corner,group 2 here, and also (grouping) group 3 Okay lets start our group activity! Every group should choose your leader, secretary, and reporter. So I have here the materials. I will give you 5 minutes to do your acitivity, Please minimize your voice class! Yes ma’am! (Doing their activity) (after 5 minutes) Are you done class? Not yet ma’am! (After 6 minutes) Okay finished or not finished please paste your work on the board Reporters of the group please be ready (pasteng their work) Yes ma’am! So we will start with the group 1 (reporting) Okay let’s say GOOD JOB! To group 1. GOOD JOB! Okay next, group 2. (Reporting) Let’s say VERY GOOD! To group 2 VERY GOOD! Okay the last group, proceed! (reporting) Let’s say EXCELLENT! To group 3. EXCELLENT! So, thank you everyone for your full cooperation, for this activity. (clapping) E. Explain What comes into your mind when you hear the word light? Very good! Light is a form of energy that travels from one place to another. Like sound waves and ocean waves, light is also a kind of waves. However, light don’t need medium such as air or water to travel. They can move even in empty space. Our eyes are sensitive to a certain kind of light called visible light. Visible light is all the colors (red, yellow, blue, etc.) What are the different properties of light? The different properties of light of travel in a straight line. It can be reflected and refracted. So there four properties of light: Reflection, refraction, diffraction and interference. Reflection- light bounces off surface at same angle it hits. Refraction- bending of waves when passing from one medium to another. Diffraction- bending of waves around a barrier. Interference- when two waves meets, they have an effect with each other. What are the characteristics of (Answers may vary) light? - Light is an electromagnetic wave. - Travels in a straight line. - It is a transverse wave, and does not need any medium to travel. Again, what color flexes/bends the least? Red ma’am Yes very good! What color has the shortest wavelength? Very good! Violet ma’am I have here a diagram showing the amount of energy, frequency, and wavelength of each color component of visible light. (PICTURE OF VISIBLE SPECTRUM) Based on the diagram being presented, what happens to the energy when the wavelength becomes longer? Yes very good! That is correct when the wavelengthh becomes longer or when its size increases, the frequency decreases. Meaning to say, they have an indirect or inverse relationship. The frequency decreases. How about the relationship of energy and frequency? Why do you say so? They have a direct relationship Precisely! Thank you for your answer Because as the energy increases, the frequency also increases. Light can be reflected and absorbed. If we see something as blue, this means that blue was the only color that was If we see something as red, this means that red was the only color that was reflected, and the others were absorbed. If we see something as white, this means that it did not reflect back any of the colors of light, or all colors are absorbed. F. Elaborate Why is the sky is blue? (PICTURE OF SKY) Very good! Why clouds are white? (PICTURE OF CLOUDS) The blue color of the sky is due to the scattering of shorter wavelength of light as it passes in the atmosphere. When white light passes through these tiny droplets of water, the white light scatters all colors and when these different wavelengths of light mix together, white color is produced. Very good! Why are sunsets red? (PICTURE OF SUNSET) Very good! During sunset, the sunlight coming from the sun travels in a greater distance in the atmosphere, causing the light to pass through more particles, which makes the light with shorter wavelength to scatter more, and the light with How are rainbows formed? When the white light and the water droplets from the atmosphere interact together, rainbows can be seen on the Very good! sky. Rainbows are formed when light passes through the water droplets in the atmosphere separating the white light into its constituent colors. So, do you have any questions class? Clarrification? None ma’am G.Evaluate Let’s us have a short quiz. Get 1/4 sheet of pad paper. Direction: Read and choose the letter of the correct answer. 1. What colors flexes/bends the most? A. Violet b. red c. orange d. yellow 2. It is a form of energy that travels from one place to another. A. Visible light b. light c. rainbow d. clouds 3. What colors flexes/bends the least? A. Violet b. red c. orange d. yellow 4. It is a properties of light bounces off the surface at same angle it hits. A. Diffraction b. reflection c. interference d. refraction 5. What color has the shortest wavelength? A. Red b. orange c. violet d. yellow 6. What happens to the energy when the wavelength becomes longer? A. The wavelength becomes shorter B. The frequency decreases C. The wavelength becomes longer D. The frequency increases Answer: 1. a 2. b 3. b 4. b 5. c 6. d 7-10. Reflection, Refraction, Interference, Interference. 7-10. Give the different properties of light. (exchanging their papers) Okay finished or not finished please exchange you papers with your seatmate. Ma’am! (done checking) (clapping their hands) Okay who got perfect? Very good! Most of you got the highest scores. H. Extend Assignment: Essay What is visible light?
