Chapter 5, Section 6 Reflected Light

HW: 5.6 PTG, #1-7, pg. 546, Due Friday Do Now: Agenda: 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

Date:April 16, 2012 HW: 5.6 PTG, #1-7, pg. 546, Due Friday 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: Set up notebook for lab #7-13 Pg. 540-541 Sentence starters and data tables Agenda: Do Now Investigate Summary

Investigate Read #1-3 (as Class) Read rest of investigate and list all materials for lab Check off with teacher

Date:April 16, 2012 HW: 5.6 PTG, #1-7, pg. 546, Due Friday 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: Review/Set up notebook for lab #4-13 Pg. 540-541 Make sure that you have your Data tables. Agenda: Do Now Investigate Summary

Investigate Set up notebook for #1-3 Complete #1-3, OK with teacher

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

Remember-HW DUE FRIDAY!!! 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: Explain the relationship between the angle of incidence and angle of reflection Agenda: Do Now Mazes Notes

Your Challenge-Laser Maze Puzzle Build a laser maze with your group (15min) Create a maze that demonstrates knowledge of angle of incidence and angle of reflection You may use: Books, a light, notebooks etc. Maze must fit on your table Must use 3 mirrors Must give the group who is going to solve your puzzle a starting point for the laser and a “target” for them to hit.

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

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 light rays? They are reflected off at the same angle 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? Also draw where the image is located 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)

Do Now A angle of incidence and a ____________ are ______________. If a ray reflects off a mirror with a angle of 30°. The angle of incidence is ______? What is the degree of angle for the other angle on the same side as the angle of incidence?

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

Do Now In your notebooks Draw a mirror with a “Normal” Draw a angle of incidence of 45°. Draw and label degrees of the angle of reflection and other 2 angles. A person is looking through there rearview mirror at a license plate on a car that has WOWO on it. What does the license plate appear to spell to the driver looking in the rearview mirror?

Essential Questions Pg. 545 What does it mean? How do you know? LO and SC reflection 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 Essential Questions Pg. 545 What does it mean? How do you know? Why should you care?