Daily Work Organizer Tuesday Question of the Day: How do we know how far stars are from earth? Do...

Daily Work Organizer

Tuesday Question of the Day: How do we know how far stars are from earth?

Do Now:

Is your intelligence something very basic about you that you can’t really change?

Why or why not?

Agenda: • Introduction to Light• Cornell notes

HomeworkHomework:Finish Cornell

Put your HW next to your DWO. Remember to pick up your graded

work from the box!

Readers TheatreExcerpt from: The secret to raising

smart kids1. Read the paragraph out loud

together2. Read every other line and switch

(partner 1 will read the first line, and partner 2 will read the second)

3. When you get to the end of the paragraph, start again! Try using funny accents!

It’s what we see…

Light Speed

•light around the earth

•300,000,000 m/s

•3 x 108 m/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

•170, 000 lightyears away

•How many years ago did it occur?

How far light travels in 1 year

Refraction•the bending of light when passing

through a new (transparent) substance

Plane Mirrors: The Flat Mirrors

Plane Mirrors

•Incident ray hits the mirror

•Reflected ray is the ray that bounces off

•The Normal is the perpendicular line from mirror

Parallaxreal screw (behind mirror)

image of screw

mirror• Parallax can be

used to find image location

• Parallax makes objects appear to move when not in the same place

• Try it

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

How do scientists calculate the distance

between Earth and some other star?

Remember to pick up your graded work from the box!

Now, to the Lab

Part I (pg 6)

Daily Work OrganizerMonday Question of the Day:

Do Now:Draw a ray of light that strikes a mirror at an angle of 30° from the mirror

Agenda: • Cornell notes

HomeworkHomework:Finish Cornell Notes

Reading Log for pg 23

Draw, measure, and label the: Normal, Incident & reflective angles.

Bonus: How could you calculate the Incident & Reflective angles without drawing anything?

Homework problems: pg 14-17

Due on Wednesday/ThursdayEvery Scholar: Problems 1, 2, 3Honors physics: above problems plus 4

Due FridayEvery Scholar: Problems 6, 7, 10Honors 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 308Also: Several scholars forgot to write

their names on their labs...

TURN IN DAILY WORK ORGANIZERS!

Whiteboard eraserPowerpoint master2 students to Handback

assignments

Salary: 1 ticket per day

Challenge ProblemsDo Challenge problems when

you are done with classworkExcellent 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!Advice: • Work with friends• Start NOW (Do not wait till last

minute)• Ask for help!

Binder quiz1st quiz on Friday

WordPicture that reminds you of definition

DefinitionWord or words that remind you of definition

Sentence using word

Incidence

The intersection of light with a surface

Intersection

mirror

Incidence Angle

Whenever light strikes a surface, the angle of incidence is equal to the

angle of reflection.

Sentence using word

Reflection

An amount of light, heat or sound that is thrown back

Throwing back, bouncing off,

mirror

Reflected Angle

Both Edward Cullen and Dracula cannot see their reflections in the mirror. How do they style their hair?

Sentence using word

Normal

A perpendicular (90°) intersection of a line or surface

Perpendicular, right angle, 90°

mirror

normal

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 = rObject distanc

=Image distanc

di to mirror) =

do (to mirror)

Image Formation

Diffuse Reflectors

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 OrganizerMonday Question of the Day:

Do Now:Complete Reflection worksheet #1

Agenda: • Homework Questions• Vocab• Reflection Worksheet • Lab Grades

HomeworkHomework:Problems 1, 2, 3

Honors: + 4

When done: Start on Worksheet #2 or #3

Find the Object

Let’s try it

turn to pg 15

Find the Object

Image to eye

14.5 cm

Object

14.5 cm

Apparent path of light

Actual path of light

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 #6In 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

Sentence using word

Parallel

Parallel lines always have the same distance between them

• Parallel of latitude

• Never crossing• 并行 (?)

Parallel lines

Parallel lines will never cross

Black Holes

The mass inside a black hole is infinitely large.

Sentence using word

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

Sentence using word

An optical appearance produced by light.

• Light rays• Not always

behind a mirror or lens

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

Sentence using word

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.

Reflection Lab Grades

Total possible points: 50Examples• -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

Example of a great response:

4.2cm and 4.5 cm. 5%

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.

What is 4.2cm???

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:1. Write a note. Staple it to the lab

and turn it into the re-grade folder2. Talk to me after school in room

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:

1. what you corrected 2. your original mistake

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

1st Quiz on Friday!

Be prepared!

What will the quiz cover?oWorksheets from class oHomeworko Vocabulary

Daily Work OrganizerWednesday Question of the Day:

Do Now:

Continue to work on Reflection Worksheets

If you finish: Challenge Problems! =)

Agenda: • Homework review• Curved mirrors (42)

Homework

Fridays Homework:Corrections to first

problem setProblems 6, 7, 8Honors: + 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

Reflection on a smooth surface

Headlight on a dry road

Sentence using word

An optical appearance produced by light.

• Light rays• Not always

behind a mirror or lens

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

Sentence using word

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.

Sentence using word

Converge

Come together from different directions to eventually meet

• Come together• Cross• Eventually meet

The students will converge in the cafeteria

Sentence using word

Diverge

Separate and go in different directions

• Separate• Grow apart • Turn away

Monkeys and Humans diverged from a common ancestor

Daily Work OrganizerFriday Question of the Day:

Do Now: A man is standing between 2 parallel mirrors and facing left.

Agenda: • Homework review• Quiz

HomeworkTuesday’s Homework:Page 24-27

Extra Credit: pg 20

mirror

If you did any extra credit

problems1.Write your name on

the homework2.Staple your

homework3.Turn it in TODAY

Do Now

mirror

object

mirror

A man is standing between 2 parallel mirrors looking

to the left. How far

away from the person are the first

three images he

Problem 6mirror

object

Problem 7: 25° with the surface of the

mirror… ?

Mirror

normal

θ = incident angle

90° = θ + 25°

90° – 25° = θ

65° = θ

But what is the question is asking?

Reflection problem 10

Virtual Image of the nose

Daily Work OrganizerTuesday Question of the Day:

Do Now:

Agenda: Cornell notesLast week’s quizDiscuss Activity pg 24-27Lab demo

HomeworkHomework:Read Lab 2 (34-35)Turn in Activity pgs

24-28Pre-Lab (honors)

Curved Mirrors

Curved Mirror Vocab

C = center of curvature radius of curvature f = focal point - rays converge F = focal length f = C / 2

Sentence using word

Center of Curvature

• Center of sphere

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

Radius of the sphere the mirror was made from

Sentence using word

Focal Point

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

Every ray crosses the focal point

Point at which rays converge (come together)

Do Now: 4 problems

1. Where is the center of curvature of a 12 inch basketball?

2. 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

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

The focal length is ½ the center of curvature

= 60 meters

Homework problems: pg 28

Due on Wednesday/ThursdayEvery Scholar: Read Lab 2 (pg 34-35)Activity pages 24 - 28Honors physics: Above plus Pre-lab

Due FridayEvery Scholar: Lab 2 (pgs 34-37)Extra credit mini project on page 20Extra Credit:

Eye chart mini project pg 20

Whiteboard eraserPowerpoint master2 students to Handback

assignments

Salary: 1 ticket per day

BoBABinder of Brilliant Answers

BoBA can be found in room 308

Excellent way to check your HW answers

Make sure you’re studying the right answers before tests & quizzes

Class Goal!

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 1: Turn in your corrected 1st quiz and receive the higher of your two scoresOption 2: Retake the quiz and receive the average of your two scores

Questions about homework or quizzes?

Room 308Tuesday 3:10Thursday 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

Apparent path

Actual path

Object

Question 7 (3 points)

Activity pg 24-28

Due on Wednesday / ThursdayWill be gradedIgnore /skip question 3 on page

Pg 25Your ray diagram should look something like this:

1. 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

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

Pg 27Your ray diagram should look something like this:

Question 5, pg 28

Draw tangent lines

Do Now: Solve for x

1. x/6 = 1/3

2. x/8 = 1/2 + 1/4

3. x/(do di )= 1/do + 1/di

4. 1/x = 1/do + 1/di

1. X = 2

2. X = 6

3. X = do + di

4. X = dodi / (do+ di)

Sentence using word

Real Image

• Image in front of mirror

• Only created by concave mirrors

Movie theatre projectors create real images on the big screen.

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

Sentence using word

Virtual Image

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 image because the reflected rays converge behind the mirror

object

Lab 2!

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)

Ignore question 2 on page 37Ignore the bottom row discussing

convex mirror data on page 38

We will talk about convex mirrors in class on Friday

Your data tableImage 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

AdviceMark & 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)

AdviceGroup 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

What is f? What is C?What is the relationship between f and C?

What is the image distance?

What is the object distance?

f = the focal lengthC = 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

Curved Mirrors

Daily Work OrganizerFriday Question of the Day: How can you find an

image location without looking into a mirror?

Do Now:

Answer the problems on pg 18-19

Agenda: Cornell notes (3-6)Mirror ray diagramsDiscuss lab results

HomeworkMonday’s Homework:Finish 30-33

Reading log: 39 - 40

Pg 37 Convex mirror

Position: Size: Larger / Smaller / SameOrientation: Upright / InvertedType: Real / Virtual

Convex mirrorpg 37

Position: Size: Larger / Smaller / SameOrientation: Upright / InvertedType: Real / Virtual

VirtualUprightSmaller

Behind the mirror

Convex mirror

Curved Mirror Vocab

C = center of curvature radius of curvature f = focal point - rays converge F = focal length f = C / 2

Real vs Virtual Images

Concave MirrorImage in frontImage is RealLight rays

convergeUse a Card

Real vs. Virtual Images

Concave Mirror

Image behind mirror

Image is virtual

Appears to converge

Concave Mirrors

through the focal point!Incoming Parallel rays reflect:

Concave Mirrors

parallel!Rays through (or from) f reflect:

Concave Mirrors

back through C!Rays through C reflect:

Convex Mirrors

away from focal point!Incoming parallel rays reflect:

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

Convex Mirrors

parallel!Rays towards focal point reflect:

Convex Mirrors

back away from C!Rays towards C reflect:

Image Location

Choose easiest

pathsParallelFocal Point(Only need 2) C “check”

Finding the ImageDraw ray pathsIdentify

Characteristics

Beyond C

larger

inverted

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

Now Go Make Your Own!

Pages 30-33

Daily Work OrganizerFriday Question of the Day:

Do Now:

Agenda: HomeworkTuesday’s Homework:Finish 30-33

Problems: 43-44

HomeworkDue Tuesday

Every Scholar: Ray Diagrams (p. 30-33)

Due WednesdayProblems (p. 43 – 47)

Due FridayCornell notesSigned progress reportPhysics text in binder

Extra Credit:

Answers pg 31

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

Image Characteristics

Concave and Convex

Concave: Object at center of Curvature

ConcaveObject between C and F

ConcaveObject between F and Mirror

Mirror EquationsSolving for f

Mirror EquationsMagnificationReally 3 different equations

Mirror Equations

ImageDistance

FocalLength

Positive

negative

Concave mirrors

Convex mirrors

In front of mirror

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.a. Find the focal length of the mirrorLet’s go over how to approach word

problems…

Solving Word Problems

1. 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.a. Find the focal length of the mirror Given:

2. Write out the equation you will use write it the way you will use it

3. Plug your numbers into the equation

Do not forget your units!

4. Calculate and write your answer! 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.b. Find the Magnification of her image. Given:

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.a. What type of image is it? Why?

Answer:Image is virtual.Why? Because image is upright.

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.b. What type of mirror is it? Why?

Answer:Mirror is convex.Why? Because image is smaller and virtual.

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.c. Find the center of curvature

1st, find di

Given:

virtual!C = ?

solve for f

Given:

solve for 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?Given:

Do Now:

Answer problems 2-5 on pg 41

Agenda: Homework

W/R Homework:Finish p. 43-47

Extra Credit:Honors

problems 12, 13, 14

Answers

1. C2. A3. C4. D5. D

HomeworkDue Wednesday / Thursday

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

Due FridayCornell notesSigned progress reportPhysics 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

Use your ray diagrams on page 30-33 to fill out

the table on pg. 38 Type of mirror

Object position

Position Relative Size

Orientation

concave

Mirror to focus

Center of Curvature

At C Same Inverted Real

Do Now:

Answer problems 6-10 on pg 42(you can use your table on pg 38)

Agenda: Homework

Friday Homework:Finish all cornell

notesFinish 43-47

Signed Progress Report

PHYSICS TEXT!

Extra Credit:Honors

problems 12, 13, 14

Answers

6. E7. A8. C9. B10.E

Sentence using word

Convex

• Outside of a sphere• Convex mirrors

have negative focal points

• - f and - C

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

A surface that curves like the outside (exterior) of a sphere

object

Sentence using word

Concave

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.

A surface that curves inwards like the inside of a sphere

object

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

Object beyond C

Object at C

Object between f and C

Object between f and the mirror

object

C Image

Concave Mirrors

Image type:

The focal length is positive for concave mirrors

The Center of curvature is positive for concave mirrors

Object anywhere

object

Convex Mirrors

The focal length is negative for convex

mirrors f C

Image type:

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 GlobeStation 3: Make-up mirror…Station 4: Concave Mirror…Station 5: Dark BoxStation 6: Practice problemsStation 7: Real vs. virtual imagesStation 8: pg 30-33 + DWO

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