Grade 8 Light Reflections - Light Refraction PDF

Waves and Their Applications Unit 1 – Module L  Standard · MS-PS4-2 Develop and use a model to describe that waves are reflected, absorbed, or transmitted through various materials Day 1 – Regular & Diffused Reflection/ Refraction Objectives: Define regular and...

Waves and Their Applications Unit 1 – Module L  Standard · MS-PS4-2 Develop and use a model to describe that waves are reflected, absorbed, or transmitted through various materials Day 1 – Regular & Diffused Reflection/ Refraction Objectives: Define regular and diffused reflection Define refraction Label reflected and refracted ray diagram Explain how refraction takes place. Compare regular and diffused reflection  Refraction ► Vocabulary Angle of incident Angle of refraction Diffused Regular  What is the difference Starter: between these two pictures?  Regular Reflection Light bounces off surface that is smooth and reflects the light in unform/single direction. Examples: mirrors, polished metals, calm water, CDs, DVDs  Diffused Reflection Light bounces off surface that is rough and reflects the light in different/multiple directions. Examples: wall, wood, irregular objects (bag, book, paper, people…) https://wordwall.net/p lay/81184/777/869 Check your understanding Watch video about REFRACTION · https://www.youtube.com/watch?v=zarxpu43-ls&ab_channel=ScienceSauce From the video: - What bends light that pass through this prism? - What is refraction?  MATTER CAN REFRACT LIGHT Light can travel through the vacuum or other medium. When light travels through a medium, it slows down and bends. This bending or change in direction of light wave as it passes from one medium to another is called refraction LABELING PARTS OF REFRACTION DIAGRAM LABEL C AND D C D Extended Activity: QUIZIZZ ▶ https://quizizz.com/admin/quiz/6352921176d4c1001d1f0813/laws-of-reflection?selfCreated=tr ue DAY 2 – Light Refraction Draw and label refraction diagram Objectives Define denser and rarer medium Explain how light travels as it pass from rarer medium to a denser medium and vice versa Compare and contrast denser and rarer medium  Rarer media VOCABULARIES Denser media STARTER Label ray diagram that shows refraction and reflection of light Previous knowledge: REMEMBER! Light travels slower in denser/thicker materials Solid Liquid Gas Vacuum Which is denser/thicker? Air or glass? Answer: Glass Light travels slower in glass (solid) than in air (gas). The light will bend as it goes slower. Glass is optically denser: particles are closer Air is optically rarer: particles are further away  Checking understanding: · Describe any refraction of light from your classroom. Describe its speed, bend, denser or rarer medium… etc.  When light travels from: Optically rare to optically denser Optically denser to optically rarer (Air to Glass) (Glass to Air) Slower Faster Light bends towards the normal Light bends away from the normal line line THINK PAIR SHARE – CHECK YOUR UNDERSTANDING Choose the correct sketch of the situation showing the interface between the media, the normal line, the incident ray, and the reflected rays to the right GROUP WORK PRACTICE DRAWING (PEER EVALUATION) Draw the reflected light in the diagrams below Exchange your paper with another group Evaluate the other group’s work using the teacher’s answer key Post your work on the bulletin board COMPARE DENSER AND RARER MEDIA Denser media Rarer media Light travels slow Light travels faster Closer particles Further away particles ACTIVITY- QUIZIZZ https://quizizz.com/admin/quiz/61702152c37755001d0501c8/ab sorption-reflection-refraction