Daily Work Organizer

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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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Daily Work Organizer

Homework:

Finish Cornell Notes

• Read the paragraph out loud together
• Read every other line and switch
• (partner 1 will read the first line, and partner 2 will read the second)
• When you get to the end of the paragraph, start again! Try using funny accents!
Light Speed
• light around the earth
• 300,000,000 m/s
• 3 x 108m/s
Light Speed
• Just over a second from the moon
Light Speed
• 8 minutes from the sun
Light Speed
• 4.2 years from Alpha Centauri! (second nearest star)
Lightyear

How far light travels in 1 year

• 170, 000 lightyears away
• How many years ago did it occur?
Refraction
• the bending of light when passing through a new (transparent) substance
Plane Mirrors
• Incident ray hits the mirror
• Reflected ray is the ray that bounces off
• The Normal is the perpendicular line from mirror
Parallax

real screw (behind mirror)

• Parallax can be used to find image location
• Parallax makes objects appear to move when not in the same place
• Try it

mirror

image of screw

Parallax
• Move head to the side
• If the image and real screw separate, then not at same place
• Try it

mirror

Parallax
• If the two move together, they are at same place
• Try it

mirror

### Now, to the Lab

Part I (pg 6)

Daily Work Organizer

• Draw, measure, and label the: Normal, Incident & reflective angles.
• Bonus: How could you calculate the Incident & Reflective angles without drawing anything?

Homework:

Finish Cornell Notes

Homework problems: pg 14-17

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

Lab 1 (pg 6-11)Due Today by 3:45pm to room 308

Also: Several scholars forgot to write their names on their labs...

TURN IN DAILY WORK ORGANIZERS!

Jobs
• Whiteboard eraser
• Powerpoint master
• 2 students to Handback assignments
• Salary: 1 ticket per day
Challenge Problems
• Do Challenge problems when you are done with classwork
• Excellent chance to review material that will be on the test!
• Later on it will become an excellent opportunity to review old material that will be on the final
• Turn in completed worksheets to the folder and receive 3 tickets
Upcoming events
• 1st physics problem set due soon!

• Work with friends
• Start NOW (Do not wait till last minute)
• Binder quiz
• 1st quiz on Friday
Vocab

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.

Vocab

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?

Vocab

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.

Reflection

Virtual Image of the nose

2 Laws of Reflection
• i = r

Object distance

Image distance

=

• di to mirror) =
• do (to mirror)
What is a summery?
• INCLUDES ALL MAIN POINTS!
• A paragraph written in full sentences.

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.

Daily Work Organizer

• When done: Start on Worksheet #2 or #3

Homework:

Problems 1, 2, 3

Honors: + 4

### Let’s try it

turn to pg 15

Find the Object

Actual path of light

Image to eye

14.5 cm

Apparent path of light

Object

14.5 cm

Yourself in a Mirror
• Minimum height of mirror?
Tip for #4
• Work backwards! Where do the rays need to reach to let everything be seen?

Tip for #6

• In order to focus you camera you must know the distance between the camera and the image
Class Pointsaka: Tickets for everyone!
• 100% homework completion
• Everyone is in their seats, silently doing the Do Now when the bell rings
Vocab

Parallel lines

Parallel

Parallel lines always have the same distance between them

• Parallel of latitude
• Never crossing
• 并行 (?)

Parallel lines will never cross

Black Holes

The mass inside a black hole is infinitely large.

Vocab

Infinite

• 无限

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

Vocab

Image

• Light rays
• Not always behind a mirror or lens

An optical appearanceproduced by light.

Interesting fact: the image is not always BEHIND the mirror!

Vocab

Object

The physical object that produces an image

• Examples: ME when I look in the mirror!

When Bella looks into the mirror she is the object. Her reflection is the image.

• Total possible points: 50
• Examples
• -2 on the front means you earned 48 / 50 points or 96%
• -10 on the front means you earned 40 / 50 points or 80%
Common Shortfalls =(
• No Full Sentences

Ex:

• Example of a great response:

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.

Common Shortfalls =(
• Not labeling the Image in Part 1

Step 9 of the procedure says: Label the image

• If you want to discuss lab grades:
• Write a note. Staple it to the lab and turn it into the re-grade folder
• Talk to me after school in room 308
Lab Corrections
• Due 1 week from the day it was due (MONDAY  Tuesday)
• Correct your lab and staple a note to the front telling me:
• what you corrected

NOTE: You can not earn points back by labeling the image…

1st Quiz on Friday!
• Be prepared!

What will the quiz cover?

• Worksheets from class
• Homework
• Vocabulary

Daily Work Organizer

Fridays Homework:

Corrections to first problem set

Problems 6, 7, 8

Honors: + 9, 10

Problem 1

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?

Vocab

Image

• Light rays
• Not always behind a mirror or lens

An optical appearanceproduced by light.

Interesting fact: the image is not always BEHIND the mirror!

Vocab

Object

The physical object that produces an image

• Examples: ME when I look in the mirror!

When you look into the mirror you are the object. Your reflection is the image.

Vocab

Converge

Come together from different directions to eventually meet

• Come together
• Cross
• Eventually meet

The students will converge in the cafeteria

Vocab

Diverge

• Separate
• Grow apart
• Turn away

Separate and go in different directions

Monkeys and Humans diverged from a common ancestor

Daily Work Organizer

1.0 m

mirror

Tuesday’s Homework:

Page 24-27

Extra Credit: pg 20

2.0 m

If you did any extra credit problems
• Write your name on the homework
• Turn it in TODAY
Do Now

How 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

Problem 6

image

object

4.5 m

2.0 m

4.5 m

2.0 m

Problem 7:

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… ?

Reflection problem 10

Virtual Image of the nose

Daily Work Organizer

Homework:

Turn in Activity pgs 24-28

Pre-Lab (honors)

Curved Mirror Vocab
• C = center of curvature
• f = focal point - rays converge
• F = focal length
• f= C /2

f

C

Vocab

Center of Curvature

• Center of sphere

The center of curvature of a 10 meter sphere is 5 meters

Vocab

Focal Point

• Where rays cross
• “ “ come together
• “ “ intersect

Point at which rays converge (come together)

f

Every ray crosses the focal point

Do Now: 4 problems
• Where is the center of curvature of a 12 inch basketball?
• A curved mirror has a center of curvature of 16 cm. What is the focal length?

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

What is the center of curvature of a golden globe award?

(the diameter of the globe is 10 cm)

The center of curvature is the center of the sphere

5 cm

What is the focal length of the death star laser if the radius of the laser dish is 120m?

The focal length is ½ the center of curvature

= 60 meters

Homework problems: pg 28

Due on Wednesday/Thursday

Every Scholar:

• Read Lab 2 (pg 34-35)
• Activity pages 24 - 28

Honors physics: Above plus Pre-lab

Due Friday

Every Scholar: Lab 2 (pgs 34-37)

Extra credit mini project on page 20

Extra Credit:

Eye chart mini project pg 20

Jobs
• Whiteboard eraser
• Powerpoint master
• 2 students to Handback assignments
• Salary: 1 ticket per day
• BoBA can be found in room 308
• Make sure you’re studying the right answers before tests & quizzes
QUIZ!

1° Class Average: 85%

2° Class Average: 74%

3° Class Average: 65.3%

4° Class Average: 73.8%

6° Class Average: 70.3%

Quiz Retakes

Friday at lunch, 12:25pm or after school at 3:25pm, Room 308

No late entry permitted

Option 2: Retake the quiz and receive the average of your two scores

Room 308

Tuesday 3:10

Thursday 3:10

Question 6 (2 points)
• Incident ray hits the mirror
• Reflected ray is the ray that bounces off
• The Normal is the perpendicular line from mirror

Question 7 (3 points)

Actual path

Object

Apparent path

Activity pg 24-28
• Due on Wednesday / Thursday
• Ignore /skip question 3 on page 27
Pg 25

Your ray diagram should look something like this:

Pg 25
• What is the orientation of the rays after being reflected from the mirrors surface?

The reflected rays diverge.

The rays will never intersect (cross) because they are diverging

Pg 25

2. How does the focal length compare to the center of curvature?

The focal length is ½ the center of curvature

Pg 26

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

Pg 27

Your ray diagram should look something like this:

Question 5, pg 28

Draw tangent lines

Do Now: Solve for x

X = 2

X = 6

X = do + di

X = dodi/ (do+ di)

• x/6 = 1/3
• x/8 = 1/2 + 1/4
• x/(dodi )= 1/do + 1/di
• 1/x = 1/do+ 1/di
Vocab

Real Image

• Image in front of mirror
• Only created by concave mirrors

Occur when light rays from an object reflect from a mirror and converge

Movie theatre projectors create real images on the big screen.

Vocab

Virtual Image

image

object

2.0 m

2.0 m

Occur when light rays from an object reflect off a mirror and diverge

• Virtual images are behind the mirror

My reflection in a plane mirror is a virtual imagebecause the reflected rays converge behind the mirror

How do you calculate the focal length of a curved mirror?

1/f =1/do +1/di

1/Focal length =

1/object distance + 1/image distance

f = dodi/ (do + di)

Note
• Ignore question 2 on page 37
• Ignore the bottom row discussing convex mirror data on page 38

We will talk about convex mirrors in class on Friday

• Image Size; either larger, smaller, or same.
• Image Orientation; either upright or inverted.
• Image Position; either behind mirror (distance will be negative), between mirror and object, at object, or beyond object
• Mark & number all 11 object and image distances on your paper
• Record the object size, orientation & location of each image (skip recording the object and image distances, you can measure those later)

Group Roles

• 1 person measure the object and image distances
• 1 person calculate the focal point
• Remaining group members should do part 2 of the lab

f = the focal length

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

• What is f?
• What is C?
• What is the relationship between f and C?
• What is the image distance?
• What is the object distance?

Daily Work Organizer

Monday’s Homework:

Finish 30-33

Pg 37 Convex mirror

Position:

Size: Larger / Smaller / Same

Orientation: Upright / Inverted

Type: Real / Virtual

Convex mirrorpg 37

Behind the mirror

Position:

Size: Larger / Smaller / Same

Orientation: Upright / Inverted

Type: Real / Virtual

Smaller

Upright

Virtual

Curved Mirror Vocab
• C = center of curvature
• f = focal point - rays converge
• F = focal length
• f= C /2

f

C

Real vs Virtual Images
• Concave Mirror
• Image in front
• Image is Real
• Light rays converge
• Use a Card
Real vs. Virtual Images
• Concave Mirror
• Image behind mirror
• Image is virtual
• Appears to converge

C

f

Concave Mirrors

Incoming Parallel rays reflect:

through the focal point!

C

f

Concave Mirrors

Rays through (or from) f reflect:

parallel!

C

f

Concave Mirrors

Rays through C reflect:

back through C!

C

f

Convex Mirrors

Incoming parallel rays reflect:

away from focal point!

C

f

Convex Mirrors

Rays towards focal point reflect:

parallel!

Note: Only the red lines are used to locate the image

C

f

Convex Mirrors

Rays towards C reflect:

back away from C!

Choose easiest paths
• Parallel
• Focal Point
• (Only need 2)
• C “check”

image

Finding the Image
• Draw ray paths
• Identify Characteristics
• R = Region
• S = Size
• O = Orientation
• T = Type of Image

Beyond C

larger

inverted

Real

### Now Go Make Your Own!

Pages 30-33

Daily Work Organizer

Tuesday’s Homework:

Finish 30-33

Problems: 43-44

Homework

Due Tuesday

Every Scholar:

• Ray Diagrams (p. 30-33)

Due Wednesday

• Problems (p. 43 – 47)

Due Friday

• Cornell notes
• Signed progress report
• Physics text in binder

Extra Credit:

• R = Region
• S = Size
• O = Orientation
• T = Type of Image

### Image Characteristics

Concave and Convex

Concave:
• Object at center of Curvature
Concave
• Object between C and F
Concave
• Object between F and Mirror
Mirror Equations

Solving for f

Mirror Equations
• Magnification
• Really 3 different equations
Mirror Equations

In front of mirror

Concave mirrors

Convex mirrors

Behind mirror

### Let’s try some examples!

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…

### Solving Word Problems

(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 = ?

### Solving Word Problems

Write out the equation you will use

write it the way you will use it

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 = ?

### Solving Word Problems

Plug your numbers into the equation

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 = ?

### Solving Word Problems

Box it!

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.

### 1.2 You are 2.0 m tall and stand 1.5 m in front of a mirror. You see an image of yourself that is upright and half your size.

Image is virtual.

Why? Because image is upright.

a. What type of image is it? Why?

### 1.2 You are 2.0 m tall and stand 1.5 m in front of a mirror. You see an image of yourself that is upright and half your size.

Mirror is convex.

Why? Because image is smaller and virtual.

b. What type of mirror is it? Why?

### 1.2 You are 2.0 m tall and stand 1.5 m in front of a mirror. You see an image of yourself that is upright and half your size.

Given:

c. Find the center of curvature

1st, find di

virtual!

C = ?

### 1.2 You are 2.0 m tall and stand 1.5 m in front of a mirror. You see an image of yourself that is upright and half your size.

Given:

Find the center of curvature

solve for f

C = ?

### 1.2 You are 2.0 m tall and stand 1.5 m in front of a mirror. You see an image of yourself that is upright and half your size.

Given:

Find the center of curvature

solve for C

C = ?

Given:

### 1.3 A convex mirror has a center of curvature of 68 cm. If the image is located 22 cm from the mirror, where is the object?

Daily Work Organizer

W/R Homework:

Finish p. 43-47

Extra Credit:

Honors problems 12, 13, 14

• C
• A
• C
• D
• D
Homework

Due Wednesday / Thursday

• Problems (pg. 43 – 47)
• Honors problems: #12-14

Due Friday

• Cornell notes
• Signed progress report
• Physics text in binder

Extra Credit:

Honors problems 12, 13, 14

On pg 46

Pg 43-47 Each question is worth 3 points…

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

Cornell Notes

1/3 for completeness

1/3 for notes and questions in margins

1/3 for summaries

Daily Work Organizer

Friday Homework:

Finish all cornell notes

Finish 43-47

Signed Progress Report

PHYSICS TEXT!

Extra Credit:

Honors problems 12, 13, 14

• E
• A
• C
• B
• E
Vocab

+

-

Convex

f

object

• Outside of a sphere
• Convex mirrors have negative focal points
• - f and - C

A surface that curves like theoutside (exterior) of a sphere

Convex mirrors only produce virtual images. The image is always behind the mirror.

Vocab

+

-

Concave

f

• Cave
• Inside of a sphere
• + f and + C

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.

Concave Mirrors

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

Convex Mirrors

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

Stations!

Station 8

• Pink book card
• Ray diagrams (pg. 30-33)
• Daily Work Organizer
Corrections to Practice Problems

A.)

di = 22.3 cm

hi = 1.95 cm

Stations!

Station 1: Spoons…

Station 2: Gazing Globe

Station 3: Make-up mirror…

Station 4: Concave Mirror…

Station 5: Dark Box

Station 6: Practice problems

Station 7: Real vs. virtual images

Station 8: pg 30-33 + DWO