Daily Work Organizer. Put your HW next to your DWO. Remember to pick up your graded work from the box! . Homework : Finish Cornell Notes. Readers Theatre Excerpt from: The secret to raising smart kids. Read the paragraph out loud together Read every other line and switch
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Homework:
Finish Cornell Notes
real screw (behind mirror)
mirror
image of screw
mirror
Part I (pg 6)
Homework:
Finish Cornell Notes
Reading Log for pg23
Due on Wednesday/Thursday
Every Scholar: Problems 1, 2, 3
Honors physics: above problems plus 4
Due Friday
Every Scholar: Problems 6, 7, 10
Honors physics: above problems plus 8, 9
Extra Credit:
problem 5& any Honors problems
Also: Several scholars forgot to write their names on their labs...
TURN IN DAILY WORK ORGANIZERS!
Advice:
Incidence
Incidence Angle
mirror
The intersection of light with a surface
Intersection
Whenever light strikes a surface, the angle of incidence is equal to the angle of reflection.
Reflection
Reflected Angle
mirror
An amount of light, heat or sound that is thrown back
Throwing back, bouncing off,
Both Edward Cullen and Dracula cannot see their reflections in the mirror. How do they style their hair?
normal
Normal
mirror
A perpendicular (90°) intersection of a line or surface
Perpendicular, right angle, 90°
The line normal to the mirror is 90° from the mirror. The normal is between the incident and reflected rays.
Virtual Image of the nose
Example: The angle of incidence is equal to the angle of Reflection. The Normal is an imaginary line drawn 90 degrees to the mirror and is an equal number of degrees from both the incident and reflected rays.
turn to pg 15
Tip for #6
Parallel lines
Parallel
Parallel lines always have the same distance between them
Parallel lines will never cross
The mass inside a black hole is infinitely large.
Infinite
∞
Limitless or endless. Impossible to measure or calculate
Black Holes! Larger than the largest number
The mass inside a black hole is infinitely large.
The number closest to 0 that is not 0 is infinitely small
Image
An optical appearanceproduced by light.
Interesting fact: the image is not always BEHIND the mirror!
Object
The physical object that produces an image
When Bella looks into the mirror she is the object. Her reflection is the image.
Ex:
4.2cm and 4.5 cm. 5%
Whatis 4.2cm???
The distance from the object to the mirror is 7.7cm and the distance from the mirror to the image is 7.6cm. The percent difference is 1.3% which indicates that these distances are very close.
Step 9 of the procedure says: Label the image
NOTE: You can not earn points back by labeling the image…
Fridays Homework:
Corrections to first problem set
Problems 6, 7, 8
Honors: + 9, 10
What happens to the surface of the road when it is wet?
Water fills in crevices (bumps) creating a smooth surface for light to reflect upon
Why?
Image
An optical appearanceproduced by light.
Interesting fact: the image is not always BEHIND the mirror!
Object
The physical object that produces an image
When you look into the mirror you are the object. Your reflection is the image.
Converge
Come together from different directions to eventually meet
The students will converge in the cafeteria
Diverge
Separate and go in different directions
Monkeys and Humans diverged from a common ancestor
A man is standing between 2 parallel mirrors looking to the left.
Do NowHow far away from the person are the first three images he sees?
mirror
object
1.0 m
1.0 m
2.0 m
3.0 m
2.0 m
But what is the question is asking?
θ = incident angle
90° = θ + 25°
normal
90° – 25° = θ
θ
65° = θ
25°
25° with the surface of the mirror… ?
Virtual Image of the nose
f
C
Center of Curvature
Radius of the sphere the mirror was made from
The center of curvature of a 10 meter sphere is 5 meters
Focal Point
Point at which rays converge (come together)
f
Every ray crosses the focal point
1. The center of curvature is the center of the basketball = 6 inches radially inwards
2. The focal length is ½ the center of curvature = 8cm
(the diameter of the globe is 10 cm)
The center of curvature is the center of the sphere
5 cm
The focal length is ½ the center of curvature
= 60 meters
Due on Wednesday/Thursday
Every Scholar:
Honors physics: Above plus Prelab
Due Friday
Every Scholar: Lab 2 (pgs 3437)
Extra credit mini project on page 20
Extra Credit:
Eye chart mini project pg 20
85%
80%
1° Class Average: 85%
2° Class Average: 74%
3° Class Average: 65.3%
4° Class Average: 73.8%
6° Class Average: 70.3%
Friday at lunch, 12:25pm or after school at 3:25pm, Room 308
No late entry permitted
Option 1: Turn in your corrected 1st quiz and receive the higher of your two scores
Option 2: Retake the quiz and receive the average of your two scores
Your ray diagram should look something like this:
The reflected rays diverge.
The rays will never intersect (cross) because they are diverging
2. How does the focal length compare to the center of curvature?
The focal length is ½ the center of curvature
3. If you had a 10 cm Christmas tree bulb that was 10 cm in diameter, what would it’s focal length be?
The focal length is ½ the center of curvature = 5 cm
Your ray diagram should look something like this:
Draw tangent lines
X = 2
X = 6
X = do + di
X = dodi/ (do+ di)
Real Image
Occur when light rays from an object reflect from a mirror and converge
Movie theatre projectors create real images on the big screen.
Virtual Image
image
object
2.0 m
2.0 m
Occur when light rays from an object reflect off a mirror and diverge
My reflection in a plane mirror is a virtual imagebecause the reflected rays converge behind the mirror
1/f =1/do +1/di
1/Focal length =
1/object distance + 1/image distance
f = dodi/ (do + di)
We will talk about convex mirrors in class on Friday
Group Roles
C = the center of Curvature
f = C/2
The focal length is ½ of the center of curvature
di= distance from paper to mirror
do = distance from light filament to mirror
Position:
Size: Larger / Smaller / Same
Orientation: Upright / Inverted
Type: Real / Virtual
Behind the mirror
Position:
Size: Larger / Smaller / Same
Orientation: Upright / Inverted
Type: Real / Virtual
Smaller
Upright
Virtual
f
C
f
Convex MirrorsRays towards focal point reflect:
parallel!
Note: Only the red lines are used to locate the image
Beyond C
larger
inverted
Real
Pages 3033
Due Tuesday
Every Scholar:
Due Wednesday
Due Friday
Extra Credit:
Concave and Convex
Solving for f
1.1 A girl is using a concave makeup mirror to get ready for the prom and is 27 cm in front of the mirror. The image is 65 cm behind the mirror.
Find the focal length of the mirror
Let’s go over how to approach word problems…
List your given information
(numbers you can use in eqns)
make sure to label them with a variable
sometimes this includes a picture
1.1 A girl is using a concave makeup mirror to get ready for the prom and is 27 cm in front of the mirror. The image is 65 cm behind the mirror.
Given:
a. Find the focal length of the mirror
f = ?
1.1 A girl is using a concave makeup mirror to get ready for the prom and is 27 cm in front of the mirror. The image is 65 cm behind the mirror.
Given:
a. Find the focal length of the mirror
f = ?
1.1 A girl is using a concave makeup mirror to get ready for the prom and is 27 cm in front of the mirror. The image is 65 cm behind the mirror.
Given:
a. Find the focal length of the mirror
f = ?
1.5 A girl is using a concave makeup mirror to get ready for the prom and is 27 cm in front of the mirror. The image is 65 cm behind the mirror.
Given:
a. Find the focal length of the mirror
1.5 A girl is using a concave makeup mirror to get ready for the prom and is 27 cm in front of the mirror. The image is 65 cm behind the mirror.
Given:
b. Find the Magnification of her image.
Answer:
Image is virtual.
Why? Because image is upright.
a. What type of image is it? Why?
Answer:
Mirror is convex.
Why? Because image is smaller and virtual.
b. What type of mirror is it? Why?
Given:
c. Find the center of curvature
1st, find di
virtual!
C = ?
Given:
Find the center of curvature
solve for f
C = ?
Given:
Find the center of curvature
solve for C
C = ?
Due Wednesday / Thursday
Due Friday
Extra Credit:
Honors problems 12, 13, 14
On pg 46
1 point for writing the given information on the left hand side and an equation you could use to solve the problem
1 point for the correct answer
1 point for a boxed answer
Extra Credit:
Honors problems 12, 13, 14
Friday Homework:
Finish all cornell notes
Finish 4347
Signed Progress Report
PHYSICS TEXT!
Extra Credit:
Honors problems 12, 13, 14
+

Convex
f
object
A surface that curves like theoutside (exterior) of a sphere
Convex mirrors only produce virtual images. The image is always behind the mirror.
+

Concave
f
object
A surface that curves inwards like theinside of a sphere
If it rains, you could stand under a concave mirror to keep dry. If you stood between the mirror and focal point your image would be virtual.
Object beyond C
Object between f and C
Image type:
Image type:
object
object
object
object
f
C
C
C
C
f
Object between f and the mirror
Object at C
Image type:
Image type:
Image
f
f
Image
Image
Image
The focal length is positive for concave mirrors
The Center of curvature is positive
for concavemirrors
+

f
Object anywhere
Image type:
object
C
C
The focal length is negative for convex mirrors

+
Image
f
f
The object distance is always positive because the object cannot go behind the mirror
Convex only produce virtual images
Station 1: Spoons…
Station 2: Gazing Globe
Station 3: Makeup mirror…
Station 4: Concave Mirror…
Station 5: Dark Box
Station 6: Practice problems
Station 7: Real vs. virtual images
Station 8: pg 3033 + DWO