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Chapter 5, Section 6

Chapter 5, Section 6. Reflected Light. 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

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Chapter 5, Section 6

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  1. Chapter 5, Section 6 Reflected Light

  2. 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: • Copy LO and SC on a new left side page • WDYS/WDYT pg. 538 • Agenda: • Do Now • Investigate • Summary

  3. Date:April 16, 2012HW: 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

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

  5. Date:April 16, 2012HW: 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

  6. 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

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

  8. 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

  9. 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.

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

  11. 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

  12. 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

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

  14. 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

  15. 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? • Also draw where the image is located

  16. 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)

  17. 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?

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

  19. 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?

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

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