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http://www.ece.gatech.edu/academics/outreach/step-up/lesson_plans/2010/Refraction/REFRACTION-OF-LIGHT.pdf

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0 2 3 5 TITLE OF

CHAPTER/TOPIC No Title Non-

Relevant Title

Appropriate Title Given

with Grammatical

Errors

Appropriate Title Given

0-3 4-6 8 10 SYNOPSIS OF

CHAPTER/TOPIC Requirement

not Met/Very

Unorganized with

Grammatical Errors

Unorganized with/without Grammatical

Errors

Clear, Concise Synopsis

with a few Grammatical

Errors

Clear, Concise Synopsis with no

Grammatical Errors

0 - 6 8 - 12 14 -18 20 SECTION

OBJECTIVES Requirement not Met/Less than 50% of

Section Objectives Answered Correctly

50 – 74% of Section

Objectives Answered Correctly

At least 75 % of Section Objectives Answered Correctly

All Section Objectives Answered Correctly

0 - 3 4 - 6 7 - 9 10 IMPORTANT

TERMS Requirement not Met/Less than 50% of

Terms Defined

Correctly

50 – 74% of Terms

Defined Correctly

At least 75 % Terms Defined

Correctly

All Terms Defined

Correctly

0 - 3 4 - 6 7 - 9 10 EQUATIONS Requirement

not Met/Less than 50% of Equations

Defined Correctly

50 – 74% of Equations

Defined Correctly

At least 75 % Equations

Defined Correctly

All Equations

Defined Correctly

0 - 3 4 - 5 7 - 8 10 SECTION VISUALS

Missing More than 4 Meaningful

Visuals

Missing 3-4 Meaningful

Visuals

Missing 1-2 Meaningful

Visuals

At least Two Meaningful Visuals for

Each Section

0 - 3 4 - 6 8 10 TYPED FLASH

CHARTS Requirement not Met/Less than 75% of Flash Chart

is Typed (sans

calculation)

At least 75 % of Flash

Chart is Typed (sans calculations)

All of the Flash Chart

is Typed (messy

calculations)

All of the Flash Chart

is Typed (sans

calculations but they are

written neatly)

4 6 8 10 CONTENT QUALITY

Content Quality is

Poor

Content Quality is

Satisfactory

Content Quality is

Very Good

Content Quality is Excellent

4 6 8 10 ORGANIZATION/

NEATNESS Majority of Flash Chart

is Unorganized

Some Sections of the Flash Chart are

Unorganized

Flash Chart is Organized

Flash Chart is Very

Organized

1 2 3 5 CREATIVITY/ PERCEIVED

EFFORT

Very Little Perceived

Effort

Some Perceived

Effort

Creative Touches

Were Added/ Some

Perceived Effort

Meaningful Creative Touches

Were Added/ A lot of

Perceived Effort

+

+

^=<LA+/=@<>AH++mmmmmmmmmmmmmmmmmmmmmm+

+

+

&=>9E+-G=:;H++mmmmmmmmmmmmmmmmmmmmmmm+

RUBRIC FOR POSTER/BROCHURE/VIDEO/COMIC BOOK

Name(s): _____________________________ Project: _________________ Period(s): ____

CRITERIA

POINTS

0-11 12-17 18-23 24-30

QUALITY OF INFORMATION

Information does not relate to the task and is difficult to follow.

Information is somewhat related to the task.

Information presented is relative to task and information is somewhat easy to understand.

Information presented is very relative to task and information is very easy to understand.

0-11 12-17 18-23 24-30

VISUAL NEATNESS AND ORGANIZATION

Project is very messy and unorganized. Very little effort is perceived.

Project is a little messy and/or unorganized. Some effort is perceived.

Project is fairly neat and organized. A good amount of effort is perceived.

Project is very neat and organized. A great deal of effort is perceived.

0-3 4-9 10-15 16-20

CREATIVITY

Project shows no creative thought in presentation.

Project displays some creative thought.

Project is creative and relevant to the task. (Creative Flare)

Very creative and relevant to the task. A very unique presentation.

0-4 5-7 8 10

TECHNICAL ASPECTS (GRAMMAR/SPELLING,

ETC.)

Many technical mistakes (more than three).

Two to three technical mistakes.

One technical mistake.

No technical mistakes.

0 4-7 8 10

REFERENCES

No references Some type of reference and documentation.

At least two quality references.

At least two quality references documented correctly.

Total Points: ______________/100

Teacher Comments:

REFRACTION AND OPTICAL PHENOMENA WORKSHEET

Name: ______________________________ Date: ____________ Period: _______

1. What is the velocity of light in a polystyrene bead (n = 1.49)?

2. What is the index of refraction of an unknown liquid if the speed of light through the liquid is 1.999 E 8 m/s?

3. Find the angle of refraction for a ray of light that enters cubic zirconia (n = 2.20) from glycerine (n = 1.473) at an angle of 26o to the normal.

4. A ray of light traveling in air enters a slab of transparent material. The incoming ray makes an angle of 53o with the normal, and the refracted ray makes an angle of 33o with the normal. Find the index of refraction of the transparent material.

5. A snorkeler under water looks up and sees a bird flying above the water. The bird appears to be 2 meters above the water. What is the actual location of the bird?

6. A 9 cm thick glass block (n = 1.5) lies on top of a stamp. How thick does the glass block appear to be?

7. What is the critical angle of light traveling through ice (n = 1.309) into air?

8. The critical angle of an unknown liquid mixed with water (n = 1.333) is 55o. What is the unknown liquid’s index of refraction?

9. A) After a storm, a man walks out onto his porch. Looking to the east, he sees a rainbow that has formed above his neighbor’s house. What time of day is it, morning or evening?

B) Why does the arc of a rainbow appear with red colors on top and violet colors on the bottom?

10. What are the conditions necessary for the occurrence of a mirage?

!

!

ANSWER KEY: REFRACTION AND OPTICAL PHENOMENA WORKSHEET

Name: ______________________________ Date: ____________ Period: _______

1. What is the velocity of light in a polystyrene bead (n = 1.49)?

n = c/v !! v = (3 E 8 m/s) / (1.49) = 2 E 8 m/s

2. What is the index of refraction of an unknown liquid if the speed of light through the liquid is 1.999 E 8 m/s?

n = c/v !! (3 E 8 m/s) / (1.999 E 8 m/s) = 1.5

3. Find the angle of refraction for a ray of light that enters cubic zirconia (n = 2.20) from glycerine (n = 1.473) at an angle of 26o to the normal.

ni (sin!! i) = nr(sin!! r) !!1.473 (sin 26º) = 2.20(sin!! r) !! (sin!! r) = (0.646)/2.20 !! !! r = sin-1 (0.294) =

17o

4. A ray of light traveling in air enters a slab of transparent material. The incoming ray makes an angle of 53o with the normal, and the refracted ray makes an angle of 33o with the normal. Find the index of refraction of the transparent material.

ni (sin!! i) = nr(sin!! r) !!1 (sin 53º) = nr(sin33o) !! nr = (0.799) / 0.545 = 1.45

5. A snorkeler under water looks up and sees a bird flying above the water. The bird appears to be 2 meters above the water. What is the actual location of the bird?

h’/h = nr/ni !! 2 m/h = 1.333/1 !! h = 2 m/1.333 = 1.5 m

6. A 9 cm thick glass block (n = 1.5) lies on top of a stamp. How thick does the glass block appear to be?

h’/h = nr/ni !! h’/9 cm = 1/1.5 !! h’ = 6 cm

7. What is the critical angle of light traveling through ice (n = 1.309) into air?

sin!!c = nr/ni !! sin!!c = 1/1.309 !! !!c = sin-1(0.764) !! 49.8o

8. The critical angle of an unknown liquid mixed with water (n = 1.333) is 55o. What is the unknown liquid’s index of refraction?

sin!!c = nr/ni !! sin 55o = nr/1.333 !! nr = 1.09

9. A) After a storm, a man walks out onto his porch. Looking to the east, he sees a rainbow that has formed above his neighbor’s house. What time of day is it, morning or evening?

Evening, since the sun rises in the east and sets in the west and because the sun must be behind him to see the rainbow

B) Why does the arc of a rainbow appear with red colors on top and violet colors on the bottom?

Violet light is bent more than red light as it passes through the drops of water due to their wavelengths

10. What are the conditions necessary for the occurrence of a mirage?

Inferior: The air next to the ground must be hotter than the air above it.

Superior: The air next to the water must be cooler than the air above it (and the object must be past the horizon).!

!

!

REFRACTION AND LENSES WORKSHEET

Name: _____________________________ Date: ____________ Period: _____

1. An object is placed 16 cm in front of a converging lens of focal length 9 cm. Find the image distance and the magnification. Describe the image.



4. An object is placed 7 cm in front of a diverging lens of focal length 10 cm. Find the image distance and the magnification. Describe the image.

5. A diverging lens is used to form a virtual image of an object. The object is 80 cm in front of the lens, and the image is 40 cm in front of the lens. Determine the focal length of the lens.

6. Where must an object be placed to have a magnification of 3.00 in a diverging lens of focal length 11 cm?

7. In order to get an upright image, slides must be placed upside down in a slide projector. What type of lens must the slide projector have? Is the slide inside or outside the focal point of the lens?

8. Sherlock Holmes examines a clue by holding his magnifying glass (with a focal length of 15 cm) 8 cm away from an object. Find the image distance and the magnification. Describe the image that he observes.

!!!!!!

!!

!

ANSWER KEY:

REFRACTION AND LENSES WORKSHEET

Name: _____________________________ Date: ____________ Period: _____


1/p + 1/q = 1/f !! q = (1/9 cm – 1/16 cm)-1 !! q = +20.57 cm

M = -q/p !! - (+20.57 cm)/(16 cm) = - 1.3

Real, inverted, magnified


1/p + 1/q = 1/f !! q = (1/12 cm – 1/6 cm)-1 !! q = -12 cm

M = -q/p !! - (-12 cm)/(6 cm) !! +2

Virtual, upright, magnified


1/p + 1/q = 1/f !! q = (1/5 cm – 1/15 cm)-1 !! +7.5 cm

M = -q/p !! - (+7.5 cm)/(15 cm) = - 0.5

Real, inverted, reduced

4. An object is placed 7 cm in front of a diverging lens of focal length 10 cm. Find the image distance and the magnification. Describe the image.

1/p + 1/q = 1/f ! q = (-1/10 cm – 1/7 cm)-1 ! -4.12 cm

M = -q/p !! - (-4.12 cm)/(7 cm) = + 0.59

Virtual, upright, reduced

5. A diverging lens is used to form a virtual image of an object. The object is 80 cm in front of the lens, and the image is 40 cm in front of the lens. Determine the focal length of the lens.

1/p + 1/q = 1/f !! f = (1/80 cm + (-1/40 cm))-1 = - 80 cm

6. Where must an object be placed to have a magnification of 3.00 in a diverging lens of focal length 11 cm?

A diverging lens cannot form an image larger than the object

7. In order to get an upright image, slides must be placed upside down in a slide projector. What type of lens must the slide projector have? Is the slide inside or outside the focal point of the lens?

Converging lens (diverging only give upright); outside (if inside the image is virtual)

8. Sherlock Holmes examines a clue by holding his magnifying glass (with a focal length of 15 cm) 8 cm away from an object. Find the image distance and the magnification. Describe the image that he observes.

!A magnifying glass is a converging lens;

1/p + 1/q = 1/f !! q = (1/15 cm – 1/8 cm)-1 !! q = -17.1 cm

M = -q/p !! - (-17.1 cm)/(8 cm) !! +2.1

Virtual, upright, magnified

!

!

TEAM TRIVIA: REFRACTION

Instructions: Divide class into groups of 3 or 4. Pass out 4 note cards (with letters A, B, C, and D on one card each) to each group. Allow students to use scrap paper and calculators. You may provide equations to each group as well. Read the question and all the choices allowed to the class and let each group send up a representative with their answer. Every group should get a chance to answer (this is not a first come first served game). At the end of the multiple choice round pass out the Bonus Round Sheet to each group to work on (you may establish an appropriate time limit). Tally up each groups’ points. I usually give 1st place 6 pts on their evaluation, 2nd place 5 pts, etc. (you can award your winners any way that you like.

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+

1/p + 1/q = 1/f !! q = (1/4 cm – 1/7 cm)-1 !! q = +9.33 cm

M = -q/p !! - (+9.33 cm)/(7 cm) !! -1.33

Real, inverted, magnified

+

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!!ni (sin!! i) = nr(sin!! r) !!1.333 (sin 80º) = 1.65(sin!! r) !! (sin!! r) = (1.313)/1.65 !! !! r = sin-1 (0.796) =

52.7o

REFRACTION, LENSES AND OPTICAL PHENOMENA EVALUATION

Name: ____________________________________ Date: __________________ Period: ______

Please circle your answers for mathematical problems and you must show your work to earn any partial credit.

1) A ray of light enters the top of a glass of water at an angle of 38o with the normal. What is the angle between the refracted ray and the normal?

2) What is the index of refraction of a material in which light travels at a speed of 7.48 E 7 m/s through?

3) What is the critical angle for light traveling from benzene (n = 1.501) to ethyl alcohol (n = 1.361)?

4) If light travels from air with and angle of incidence of 14.5o into an unknown medium and refracts at an angle of 9.8o, what is the index of refraction of the unknown medium?

5) A person looks at a gem using a converging lens with a focal length of 10.25 cm. The lens forms a virtual image 26.5 cm from the lens. Determine the magnification. Is the image upright or inverted?

6) An object is placed in front of a diverging lens with a focal length of 22.75 cm. If the object is placed 15 cm in front of the lens, find the image distance and the magnification. Describe the image.

7) Michelle looks down into a pool and sees a penny on the bottom. The penny is actually 2.44 m below the surface of the water. What depth does it appear to be?

8) A convex lens has a focal length of 14 cm. Find the image distance if the object is placed at 28 cm. Is the image real or virtual?

9) A swimmer is underwater and looks at the diving board above her. The diving board appears to be 6 meters above the water. What is the actual distance of the diving board to the water?

10) What is dispersion? Give an example.

11) How will light bend (towards or away from the normal) as it travels from acetone (n = 1.36) to sapphire (n = 1.762)?

12) How do fiber optic devices transmit information?

13) Define the term laser and name three real-world application of lasers.

14) What type of image is produced by the cornea and the lens on the retina?

15) BONUS: A magnifying glass has a focal length of 15 cm. At what distance from a dime should you hold this lens to get an image with a magnification of +2?

!!

!ANSWER KEY: REFRACTION, LENSES AND OPTICAL

PHENOMENA EVALUATION Name: ____________________________________ Date: __________________ Period: ______

Please circle your answers for mathematical problems and you must show your work to earn any partial credit.

1) A ray of light enters the top of a glass of water at an angle of 38o with the normal. What is the angle between the refracted ray and the normal?

ni(sin!! i) = nr(sin!! r) !! 1(sin38o) = 1.333(sin!! r) !! !! r = sin-1 (0.616/1.333) = 27.5º

2) What is the index of refraction of a material in which light travels at a speed of 7.48 E 7 m/s through?

n = c/v !! n = (3 E 8 m/s)/(7.48 E 7 m/s) = 4.01

3) What is the critical angle for light traveling from benzene (n = 1.501) to ethyl alcohol (n = 1.361)?

sin!!c = nr/ni !! !!c = sin-1(1.361/1.501) = 65.06o

4) If light travels from air with and angle of incidence of 14.5o into an unknown medium and refracts at an angle of 9.8o, what is the index of refraction of the unknown medium?

ni(sin!! i) = nr(sin!! r) !! 1(sin14.5o) = nr(sin9.8o) !! nr = 1.47

5) A person looks at a gem using a converging lens with a focal length of 10.25 cm. The lens forms a virtual image 26.5 cm from the lens. Determine the magnification. Is the image upright or inverted?

M = -q/p (need p first)

1/p + 1/q = 1/f !! 1/p + 1/-26.5 cm = 1/+10.25 cm !! p = [(1/+10.25 cm) – (1/-26.5 cm)]-1 = +7.39 cm

M = - (-26.5 cm)/(+7.39 cm) = +3.59; Upright

6) An object is placed in front of a diverging lens with a focal length of 22.75 cm. If the object is placed 15 cm in front of the lens, find the image distance and the magnification. Describe the image.

1/p + 1/q = 1/f !! q = [(1/-22.75 cm) – (1/15 cm)]-1 = -9.04 cm

M = -q/p !! -(-9.04 cm)/(15 cm) =+ 0.6

Virtual, Upright, Reduced

7) Michelle looks down into a pool and sees a penny on the bottom. The penny is actually 2.44 m below the surface of the water. What depth does it appear to be?

h’/h = nr/ni !! h’ = [h(nr)]/ni !! h’ = [2.44m(1)/1.333] = 1.83 m

8) A convex lens has a focal length of 14 cm. Find the image distance if the object is placed at 28 cm. Is the image real or virtual?

1/p + 1/q = 1/f ! q = [(1/+14 cm) – (1/28 cm)]-1 = +28 cm; Real

9) A swimmer is underwater and looks at the diving board above her. The diving board appears to be 6 meters above the water. What is the actual distance of the diving board to the water?

h’/h = nr/ni ! h = [h’(ni)]/nr ! h = [6 m(1)/1.333] = 4.5 m

10) What is dispersion? Give an example.

Dispersion: the process of separating poly chromatic light into its component wavelengths

Ex) Rainbows, prisms, etc.

11) How will light bend (towards or away from the normal) as it travels from acetone (n = 1.36) to sapphire (n = 1.762)?

Towards: (FST) Fast Slow Towards;

the smaller the index of refraction the faster light can travel

12) How do fiber optic devices transmit information?

Light from a laser enters one end of the fiber and strikes the surface of the glass (or plastic) at an angle larger than the critical angle. This will cause total internal reflection and the light will be unable to escape until it reaches the other end of the fiber tube.

13) Define the term laser and name three real-world application of lasers.

Laser: Light Amplification by Stimulated Emission of Radiation !! a device that produces an intense, nearly parallel beam of coherent light; information storage and retrieval, CD players,

measurements of large distances, medical usage, scientific research (optical tweezers)

14) What type of image is produced by the cornea and the lens on the retina?

Real, inverted, reduced

15) BONUS: A magnifying glass has a focal length of 15 cm. At what distance from a dime should you hold this lens to get an image with a magnification of +2?

M = +2; if M = -q/p and M is +2 then q must be negative and twice as large as p; q = -2p

1/p + 1/q = 1/f !! 1/p + 1/-2p = 1/f !! 1/(2p) = 1/(15 cm) !! 2p = 15 cm !! p = 7.5 cm

Documents

lesson Plan - REFRACTION9%)-'%-!&(!&!52*&'!-'3-&:#.! ... 9277-(0!.-&(#'&1,-!5/+#05-(-(!6#.!)3-'0)6)-3!+.#1,-*(;! ... REFRACTION.docx

lesson Plan - REFRACTION9%)-'%-!&(!&!52&'!-'3-&:#.! ... 9277-(0!.-&(#'&1,-!5/+#05-(-(!6#.!)3-'0)6)-3!+.#1,-(;! ... REFRACTION.docx