Chapter 5 Section 6 Reflected Light Date HW

Chapter 5, Section 6 Reflected Light

Date: HW: 5. 6 PTG, #1 -7, pg. 546, Due • Learning Objective – Explain how light rays are reflected – Describe the relationship between angle of incidence and angle of reflection • Success Criteria – Observe the reflection of light by a mirror – Identify the normal of a plane mirror – Measure angles of incidence and reflection of a plane mirror – Collect evidence for the relationship between the angle of incidence and the angle of reflection for a plane mirror – Observe changes in the reflections of letters – Identify patterns in multiple reflections • Do Now: – Copy LO and SC on a new left side page – WDYS/WDYT pg. 538 • Agenda: – Do Now – Investigate – Summary

Investigate • Set up notebook for #1 -3 • Complete #1 -3, OK with teacher • Set up notebook for #4 -6 • Complete #4 -6, OK with teacher • Set up notebook for #7 -9 • Complete #7 -9, OK with teacher

Investigate • • Set up notebook for #10 -12 Complete 10 -12 Clean up area OK with teacher

Date: HW: 5. 6 PTG, #1 -7, pg. 546, Due • Learning Objective – Explain how light rays are reflected – Describe the relationship between angle of incidence and angle of reflection • Success Criteria – Observe the reflection of light by a mirror – Identify the normal of a plane mirror – Measure angles of incidence and reflection of a plane mirror – Collect evidence for the relationship between the angle of incidence and the angle of reflection for a plane mirror – Observe changes in the reflections of letters – Identify patterns in multiple reflections • Do Now: – How do you think a mirror works? • Agenda: – Do Now – Investigate – Summary

Physics Talk • What are mirrors used for? • To look at your pretty face! • Auto safety • Telescopes • Cameras • CD players • Other technology

Physics Talk • What happens when a light ray hits a mirror? • The angle of incidence=angle of reflection • Ray that strikes the surface=incident ray • Ray that is reflects off the surface=reflected ray

Physics Talk • Normal line is perpendicular to the mirror • Angle of incidence is between the incident ray and the normal line • Angle of reflection is between the normal line and the reflected ray

Physics Talk • What is the Law of Reflection? • Angle of incidence=angle of reflection!!!

Physics Talk • What happens to the • They are reflected off at the same angle light rays? they entered • If you extend the reflected rays, where they intersect is where the image appears behind the mirror • The distance from your nose to the mirror is the same as the distance from the mirror to the image in the mirror

Physics Talk • Sample problems • Draw in your notebook: – If the angle of incidence is 40°, what is the angle of reflection? – If the angle of incidence increases to 50°, what is the angle of reflection?

Physics Talk • Light as waves? • Light is a wave and has properties similar to sound waves • Light waves are transverse waves (motion is perpendicular to the direction of the wave) • Light doesn’t need a medium to travel • Also carry energy (feel warm)

Vocab Boxes • • • Angle of incidence Angle of reflection Incident ray Reflected ray Normal Law of reflection

Essential Questions • • Pg. 545 What does it mean? How do you know? Why should you care?