What are the properties of reflection, refraction and diffraction? Starter: copy out and complete the gaps i.The change of the direction of a light ray when it enters a glass block from air is an example of _________ ii.The spreading of waves when they pass through a gap is an example of ___________ iii.The image of an object seen in a mirror is formed because the mirror causes light from the object to undergo ___________ *Rate your understanding (/10) for reflection, refraction and diffraction (will update this at the end of the lesson Key words: reflection, refraction, diffraction A.Long radio waves can bend around obstacles such as hills B.Your remote control will still work if you point it away from the TV towards a flat, sold object, e.g. a plate C.The bottom of a swimming pool looks nearer than it actually is

What are the properties of reflection, refraction and diffraction? Starter: copy out and complete the gaps i.The change of the direction of a light ray when it enters a glass block from air is an example of refraction ii.The spreading of waves when they pass through a gap is an example of diffraction iii.The image of an object seen in a mirror is formed because the mirror causes light from the object to undergo reflection A.Long radio waves can bend around obstacles such as hills diffraction B.Your remote control will still work if you point it away from the TV towards a flat, sold object, e.g. a plate reflection C.The bottom of a swimming pool looks nearer than it actually is refraction /6 1/6 or 2/6 = RED 3/6 or 4/6 = YELLOW 5/6 or 6/6 = GREEN

What are the properties of reflection, refraction and diffraction? Task 1: Copy and fill out the table below (12m) DefinitionPropertiesExamples Reflectione.g. the law of reflection states that … RefractionThe change in _________ of ________ when they travel across a b_______ S_______ pool appearing s_______than it is Diffraction The n_______ a gap is, the g_________ the diffraction The w_______ a gap is, the _________ the diffraction *if extra speedy: we do not normally see diffraction of light in everyday life. Suggest a reason for this

What are the properties of reflection, refraction and diffraction? DefinitionPropertiesExamples ReflectionThe change in direction of a wave, such as a light or sound wave, away from a boundary the wave encounters e.g. the law of reflection states that the angle of incidence = the angle of reflection occurs when light changes direction as a result of "bouncing off" a surface like a mirror Mirrors e.g. mirror sign in an ambulance RefractionThe change in direction of waves when they travel across a boundary Occurs in all forms of waves (e.g. light, sound) When a light ray travels from air into glass, the angle of refraction is smaller than the angle of incidence Swimming pool appearing shallower than it is water waves White light DiffractionThe spreading out of waves when they pass through a gap or round the edge of an obstacle The narrower a gap is, the greater the diffraction The wider a gap is, the greater the diffraction Diffraction of light (e.g. telescope) Diffraction of ultrasonic waves (ultrasound) TV/radio reception

Review check 1: A, B or C? Q1. What is shown in the diagram? A.Reflection B.Refraction C.Diffraction Q2. What is shown in the diagram? A.Reflection B.Refraction C.Diffraction Q3. What is shown in the diagram? A.Reflection B.Refraction C.Diffraction

Review check 1: A, B or C? Q1. What is shown in the diagram? A.Reflection B.Refraction C.Diffraction Q2. What is shown in the diagram? A.Reflection B.Refraction C.Diffraction Q3. What is shown in the diagram? A.Reflection B.Refraction C.Diffraction

Task 2 (12m): On A4 paper, either Draw a comic strip for reflection, refraction and diffraction Draw an example for each one and label it What are the properties of reflection, refraction and diffraction? *if extra speedy: attempt the exam questions

HWK: Make a summary poster (at least one side in books) on reflection, refraction and diffraction (due Tues 30 th April ) *Update your understanding (/10) for reflection, refraction and diffraction What are the properties of reflection, refraction and diffraction? Plenary: in 3’s a.Make a learning resource (e.g. fill in the gap exercise/label a diagram/multiple choice quiz) in pairs to distribute to another group (8m) (include a mark scheme) b.You are then going to swap with another pair and complete the task (6m)