Grade 8 Light Reflection 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 – Light Reflection Objectives: Define reflection State the law of reflec...

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 – Light Reflection Objectives: Define reflection State the law of reflection Draw ray diagram of light reflection Explain how reflection allows us to see objects. Predict the angle of incident from angle of reflection Keywords ∙ Reflection ∙ Incident ray ∙ Reflected ray ∙ Angle of incident ∙ Angle of reflection  Starter activity Use a flashlight or laser pointer and a mirror to demonstrate how light reflects off a surface. Observe how light behaves when it hits a shiny surface. The bouncing of light off a surface, such as a mirror, is called Reflection Some objects, such as a flame, give off, or emit, their own light(luminous objects). Most objects do not emit light(non-luminous objects) Checking understanding: List some luminous and non-luminous objects  Non-Luminous Luminous Objects Objects  Direction of light Light waves travel from their source in all directions. When a light wave hits an object, the light wave may change direction. If you could trace the path of one light wave, you would find that it travels in a straight line until it hits a surface (Light Ray). ► Group discussion Because the light rays did not enter the eyes. How do we see objects - Think Pair share 1- Light from a source like the Sun, falls on the object. 2- The object reflects light in all possible directions. 3- The reflected light from the object reaches our eyes. 4- Our brain receives the information from the eyes making us see the object. Checking Understanding: Describe how you can see any object in your classroom.  ► The law of reflection states that when a ray of light reflects off a ► Law of reflection surface, the angle of incidence is equal to the angle of reflection Independent activity Find the angle of reflection Check your understanding Calculate angle I and angle r  Peer assessment If the angle of incidence is 20 degrees, what will be the value of the angle of reflection? Answer: 20 degrees If the angle of incidence is 45 degree, what is the angle between the incident ray and reflecting surface Answer: 45 degrees Day 2 – Parent –Teacher conference (early dismissal) Day 3 – Assessment 2 Day 4 – Project Objectives: Identifying Waste Issues in the School. Conduct a waste audit, categorizing types of waste and recording their amounts.