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
• https://www.youtube.com/watch?v=RlSSy8K_
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 – 29.5
•
•
•
•
3 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 (Ѳi)
3. Angle of Reflection (Ѳr)
4. Angle of Incidence (Ѳi) = Angle of Reflection (Ѳr)
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