SY 2022 – 2023 | CAMARINES SUR NATIONAL HIGH SCHOOL, LIBOTON ANNEX WARM UP: 4 PICS, 1 WORD Work out what the mystery word is based on the theme of the photos presented. ________ 4 PICS, 1 WORD _____ 4 PICS, 1 WORD LIGHT 4 PICS, 1 WORD __________ 4 PICS, 1 WORD REFLECTION 4 PICS, 1 WORD __________ 4 PICS, 1 WORD REFRACTION 4 PICS, 1 WORD __________ 4 PICS, 1 WORD SCATTERING 4 PICS, 1 WORD __________ 4 PICS, 1 WORD DISPERSION 4 PICS, 1 WORD ___________ 4 PICS, 1 WORD DIFFRACTION 4 PICS, 1 WORD ____________ 4 PICS, 1 WORD INTEFERENCE REFLECTION REFRACTION SCATTERING DISPERSION DIFFRACTION INTERFERENCE PHENOMENA OF LIGHT DISPERSION REFRACTION SCATTERING DIFFRACTION INTERFERENCE PHENOMENA OF LIGHT DISPERSION DIFFRACTION SCATTERING INTERFERENCE PHENOMENA OF LIGHT DISPERSION SCATTERING DIFFRACTION INTERFERENCE PHENOMENA OF LIGHT DISPERSION SCATTERING PHENOMENA OF LIGHT DISPERSION SCATTERING PHENOMENA OF LIGHT OBJECTIVES Differentiate dispersion from scattering Explain how rainbows are formed through dispersion of light. Explain why the sky is blue through scattering of light. Conduct simple-hands on activities showing the dispersion and scattering of light. OBJECTIVES Differentiate dispersion from scattering Explain how rainbows are formed through dispersion of light. Explain why the sky is blue through scattering of light. Conduct simple-hands on activities showing the dispersion and scattering of light. GROUP ACTIVITY • In this activity, you will be divided into 4 groups. • Each group will be observing either dispersion or scattering of light, depending on what is assigned to them. WORKING AREA GROUP 3 GROUP 4 GROUP 1 GROUP 2 TEACHER’S TABLE REMINDERS • Proceed to your working area silently. • Groupmates must respect one another and members of other groups as well. • Do not disturb other groups. • Students must follow the directions correctly and carefully. • The students may call the teacher’s attention if they have any queries. CAUTION This experiment uses objects that may cause harm if improperly handled. • Be careful when using sharp objects. • Be careful when handling fragile objects. • Avoid playfighting while conducting the experiment. • Stay focused and be aware of your surroundings. RUBRICS RUBRICS GROUP ACTIVITY • Each group will be given 15 minutes to work on their assigned activity. • After 15 minutes has passed, the students will report their findings in front of the class. • Each group will be given 3 minutes to report their findings. GUIDE QUESTIONS FOR REPORT For dispersion: • What was the experiment about? What did you do in your experiments? • What is Dispersion of light? • How are rainbows formed through dispersion of light? GUIDE QUESTIONS FOR REPORT For scattering: • What was the experiment about? What did you do in your experiments? • What is Scattering of light? • How does the scattering of light explain why the sky is blue/red? DISPERSION The phenomenon of splitting white light into its 7 component colors. The band of colors produced when white light is split is called a spectrum. DISPERSION HOW DOES DISPERSION HAPPEN? When light passes through a prism, it is slowed down because it changes medium (air to glass). This change in speed causes light to bend or refract. HOW DOES DISPERSION HAPPEN? The greater the wavelength the heavier the wave. The heavier the wave the more energy needed to move the wave in a different direction. As a result, the greater the wavelength, less refraction. RAINBOWS & DISPERSION Rainbows are formed when sunlight is dispersed by tiny water droplets present in the atmosphere. The water droplets act like small prisms which refracts and disperses light. RAINBOWS & DISPERSION Rainbows are formed when sunlight is dispersed by tiny water droplets present in the atmosphere. The water droplets act like small prisms which refracts and disperses light. SCATTERING Scattering is the absorption of light by tiny particles of a medium and its reemission in a particular direction. SCATTERING IN OUR EVERYDAY LIVES Sunbeams are created due to a type of scattering called TYNDAL SCATTERING. This happenes when the suspended particles are almost the same size as the wavelength of light. COLOR OF THE SKY The color of the sky is due to a type of scattering called RAYLEIGH SCATTERING. This happened when the suspended particles are much smaller the wavelength of light. COLOR OF THE SKY RAYLEIGH LAW OF SCATTERING Intensity of scattered light is inversely proportional to the fourth power of a wave. When wavelength is longer, less scattering occurs. 1 𝐼∝ 4 𝜆 COLOR OF THE SKY Among the seven colors of sunlight, which one is scattered the most? BLUE INDIGO VIOLET COLOR OF THE SKY When the sun is directly above us, blue light scatters more and is absorbed by our eyes, thus we see a blue sky. COLOR OF THE SKY At sunset, light from the sun travels farther, scattering ALL BLUE LIGHT, leaving only red and orange light. RECAP What have learned today? you RECAP “How will you apply your knowledge about the dispersion and scattering of light in your everyday lives?” REAL LIFE APPLICATION DISPERSION AND SCATTERING CAN BE USED IN INTERIOR DESIGN. REAL LIFE APPLICATION It can also be used in films/plays & photography to create added effects and emotions. Knowledge check! In a 1/4th sheet of paper, (1) differentiate dispersion from scattering; and; (2)Relate either dispersion or scattering to how rainbows are formed or why the sky is blue or red at different times of the day. ASSIGNMENT Search what light phenomena is responsible for the following: A) The formation of crepuscular rays B) Blurry edges of shadows at longer distances. THANK YOU FOR LISTENING! COLOR OF THE SKY Sun emits more blue light than violet and indigo; thus, sky appears blue.
