Chapter 29 Reflection & Refraction May 16 – 23 Mr. Gaydos

Chapter 29 Notes I. Introduction: A. Reflection: Waves incident upon a surface, some or all of the energy bounces back. B. Refraction: Waves incident upon a medium, waves are bent as they enter & travel within the medium.

Chapter 29 Outline Reflection Video Gos&list=PL5C55F4122B03492C Gos&list=PL5C55F4122B03492C

Design Problem 1. At a T-Intersection Numerous Accidents 2. Drivers’ view is blocked – A. Orientation of Roadway (Not a Perfect T) – B. Buildings & Shrubs on Corners 3. Diagram of Roadway & Obstructions Home

Design Problem Our Task Install most Efficient, Safe & Cost Effective Mirror System to alleviate this problem. – Must prove mirror system is most efficient using diagrams illustrating before & after Line of Sight. – Must show size and position of mirror system provides maximum visual coverage for drivers traveling in all directions while not causing additional glare or distracting images using annotated Ray Diagrams. – Must also demonstrate, via a trade-off study of Key Mirror Performance Parameters, which type of mirror is best to use. – Present the design with explanations during next Lab period Compensation: One Marking Period Test Grade. All team members receive the Team Grade

Design Problem Top Level Tasks – Form and Register Design Teams – Review Layout of Roadway – Acquire needed design tools Basic Understanding of Key Terms Ability to generate & manipulate Ray Diagrams – Acquire an understanding of the Key Performance Parameters (KPPs) of available mirror types (3) – Assign Team members specific tasks they will be responsible to complete.

Design Problem Detailed Tasks – Discovery: Data Mine Sections 29.1 – important Facts per section. Each Team will be assigned a different section After 10 min. each team will share with full class their findings. Use Internet references for expanded details & terms not in Text Book. – Generate Initial Concept Existing Line of Sight Diagram. Ray Diagram Evidence. Mirror Type Trade-off study (Must list the KPPs of each type of mirror and explain why one mirror is better for this application over the other). Proposed Mirror type and Position – Ray Diagram Evidence. – Proposed mirror system diagram must include illustration of improvement over Original.

Discovery II. Key Terms A. Line of Sight B. Reflection C. Law of Reflection (Ray Diagram) 1. Normal to Reflecting Boundary 2. Angle of Incidence (Ѳ i) 3. Angle of Reflection (Ѳ r) 4. Angle of Incidence (Ѳ i) = Angle of Reflection (Ѳ r) D. Mirror: A Reflecting Boundary 1. Plane (Flat) 2. Concave 3. Convex E. Light Pollution F. Noise Pollution

Mirror KPPs Plane (Flat Mirror) – Image same size as Object – Image orientation is ____________ relative to object – Image located same distance “behind” mirror as object is in front of mirror – More than one Plane mirror will result in multiple images

Mirror KPPs Concave mirror – Reflecting surface bent inwards away from object. – Image orientation is ____________ relative to object – Image location is ______________ relative to location of object. – Image size is _____________ relative to size of object.

Mirror KPPs Convex Mirror – Reflecting surface bent outwards towards object. – Image orientation is ____________ relative to object – Image location is ______________ relative to location of object. – Image size is _____________ relative to size of object