chapter 5, section 7. april 23, 2012 hw: ptg 5.7, p 555, #1-6, 8, due fri do now: 5.6 quiz p 548...
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CURVED MIRRORSChapter 5, Section 7
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April 23, 2012HW: PTG 5.7, p 555, #1-6, 8, Due Fri
Do Now:5.6 Quizp 548 WDYS/WDYT
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April 24, 2012HW: PTG 5.7, p 555, #1-6, 8, Due Fri
Do Now:Set up notebooks for numbers 1-9 starting on p.
548
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Investigation 5.7 #1 and #2
#3-9
#10-12
Record observations with concave and convex mirror
Class demo under document camera. Students record responses for #8 and #9
Students complete using same steps as 3-9.
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4/25/12Warm UP Do Now:
1. Compare and contrast a concave lens with a convex lens
1. Use the words focal point, focal length in your answer
2. Don’t just talk about the shape!
Read procedures 13-17 pg. 549Set up Notebook
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The focal point for a convex mirror is located ________, whereas the focal point for a concave mirror is located ________
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Investigation 5.7 continued #13-15 Teacher
demo with finding image
#16 -17 Students use same process with object that is outside window
Students record observations in data table like the one found in #14
Students record observations in journal and thoughts on convex mirrors
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4/27/12HW: PTG 5.7, p 555, #1-6, 8, Due Fri Learning Objectives
Compare and contrast real and virtual images
Describe focal length Success Criteria
Identify the focal point and the focal length of a curved mirror
Observe virtual images in a convex mirror
Observe real and virtual images in a concave mirror
Measure and graph image distance vs. object distance for a concave mirror
Do Now:How do the images
of concave and convex mirrors compare? How do you know?
Agenda:Do NowPhysics Talk 5.7Summary
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Physics Talk 5.7 What is a real
image?
What is a virtual image?
An image that will project on a screen – it has an actual image location
An image that will not project on a screen – the image only appears to be coming from that location
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Physics Talk 5.7 What is a concave
mirror?
What is a convex mirror?
A curved mirror in which the reflecting surface caves in
A curved mirror in which the reflecting surface bulges out
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Physics Talk 5.7 What is the
relationship between the angle of incidence and angle of reflection?
The angles are equal. This allows us to draw ray diagrams that illustrate how the light is moving
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Warm up 4/27/12
Hey yo…
I want you to describe the difference between a virtual and real image
Where is the focal point located?
Which mirror (convex or concave) produces which?
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Studying Ray Diagrams Illustrating light 3 rays
coming toward concave mirror
1. This ray is parallel to principal axis. This same ray reflects through the focal point
2. This ray approaches the center of the mirror and reflects with the same angle
3. This ray goes through focal point first, hits the mirror, and reflects parallel to the principal axis
All 3 rays must be present in ALL ray diagrams!!!
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Studying Ray Diagrams The place where all
3 rays meet is the top of the image
The rest of the image is between that point and the principal axis
All 3 rays must be present in ALL ray diagrams!!!
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Study the Diagram This is a similar
situation, except the object is farther from the mirror
This demonstrates the different sized images you saw in the lab
Find and name all three rays
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Diagram with Virtual Image
If the object is closer to the mirror than the focal length, it will produce a virtual image
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Diagram with Virtual Image
1. This ray runs parallel to the principal axis and reflects through the focal point
2. This ray goes from the object in the angle of the focal point and will reflect parallel to the principal axis
3. This ray will leave the object and reflect off the mirror where the principal axis and mirror meet with the same angle
Where do the rays meet?
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Physics Talk 5.7 Where did the rays
meet in the diagram?
Where can the image be found?
The rays never met, which means there is no real image!
The virtual image appears to be behind the mirror where the extended rays meet
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Physics Talk 5.7 How do the concave
and convex mirrors compare to plane mirrors?
With plane mirrors, the virtual image is identical in size to the object
With curved mirrors, the virtual image can be a different size
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Physics Talk 5.7 How does this work
for convex mirrors?
Find the rays
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What kind of relationship is it?
We can tell by looking at the graph, that it has the shape of a hyperbola.
This shape tells us we have an inverse relationship between object distance and image distance
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February 18, 2011HW: Vocab Boxes, Finish Learning Objectives
Compare and contrast real and virtual images
Describe focal length Success Criteria
Identify the focal point and the focal length of a curved mirror
Observe virtual images in a convex mirror
Observe real and virtual images in a concave mirror
Measure and graph image distance vs. object distance for a concave mirror
Do Now:#7, pg. 556
Agenda:Do NowRay PracticeSummaryVocab BoxesQuiz
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Honors Presentation Bri and Timera
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Practicing Ray DiagramsPTG #7, 9-12 as a class
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Ray Diagram Practice Worksheet
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Summary
Checking Up p 552 Essential Questions p 554
What does it mean?How do you know?Why should you care?
LO and SC reflections