Chapter 5, Section 6 Reflected Light. HW: 5.6 PTG, #1-7, pg. 546, Due Friday Learning Objective...

Chapter 5, Section 6Reflected 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– 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, 2012HW: 5.6 PTG, #1-7, pg. 546, Due Friday











• Do Now:– Set up notebook

for lab #7-13• Pg. 540-541• Sentence starters

and data tables


Investigate

• Read #1-3 (as Class)• Read rest of investigate and list all

materials for lab• Check off with teacher

Date:April 16, 2012HW: 5.6 PTG, #1-7, pg. 546, Due Friday











• Do Now:– Review/Set up

notebook for lab #4-13• Pg. 540-541 • Make sure that you

have your Data tables.


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








• 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?• Also draw where

the image is located

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?– 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






Chapter 5, Section 6 Reflected Light. HW: 5.6 PTG, #1-7, pg. 546, Due Friday Learning Objective...

Documents

Transcript of Chapter 5, Section 6 Reflected Light. HW: 5.6 PTG, #1-7, pg. 546, Due Friday Learning Objective...