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0
No Title
2
NonRelevant
Title
3
5
TITLE OF
Appropriate Appropriate
Title Given
CHAPTER/TOPIC
Title Given
with
Grammatical
Errors
0-3
4-6
8
10
Clear,
Clear,
SYNOPSIS OF
Requirement Unorganized
Concise
Concise
with/without
CHAPTER/TOPIC
not
Synopsis
Synopsis
Grammatical
Met/Very
with no
with a few
Errors
Unorganized
Grammatical Grammatical
with
Errors
Errors
Grammatical
Errors
0-6
8 - 12
14 -18
20
All Section
At least 75
SECTION
Requirement 50 – 74% of
Objectives
% of Section
Section
OBJECTIVES
not Met/Less
Answered
Objectives
Objectives
than 50% of
Correctly
Answered
Answered
Section
Correctly
Correctly
Objectives
Answered
Correctly
0-3
4-6
7-9
10
All Terms
At least 75
IMPORTANT
Requirement 50 – 74% of
Defined
% Terms
Terms
TERMS
not Met/Less
Correctly
Defined
Defined
than 50% of
Correctly
Correctly
Terms
Defined
Correctly
0-3
4-6
7-9
10
All
At least 75
EQUATIONS
Requirement 50 – 74% of
Equations
% Equations
Equations
not Met/Less
Defined
Defined
Defined
than 50% of
Correctly
Correctly
Correctly
Equations
Defined
Correctly
SECTION
VISUALS
TYPED FLASH
CHARTS
0-3
Missing
More than 4
Meaningful
Visuals
0-3
Requirement
not Met/Less
than 75% of
Flash Chart
is Typed
(sans
calculation)
4
CONTENT
Content
QUALITY
Quality is
Poor
4
ORGANIZATION/ Majority of
NEATNESS
Flash Chart
is
Unorganized
CREATIVITY/
PERCEIVED
EFFORT
1
Very Little
Perceived
Effort
4-5
Missing 3-4
Meaningful
Visuals
7-8
Missing 1-2
Meaningful
Visuals
4-6
At least 75
% of Flash
Chart is
Typed (sans
calculations)
8
All of the
Flash Chart
is Typed
(messy
calculations)
10
At least Two
Meaningful
Visuals for
Each Section
10
All of the
Flash Chart
is Typed
(sans
calculations
but they are
written
neatly)
10
Content
Quality is
Excellent
10
Flash Chart
is Very
Organized
6
8
Content
Content
Quality is
Quality is
Satisfactory
Very Good
6
8
Flash Chart
Some
is Organized
Sections of
the Flash
Chart are
Unorganized
2
3
5
Meaningful
Some
Creative
Creative
Perceived
Touches
Touches
Effort
Were Added/
Were Added/
Some
A lot of
Perceived
Perceived
Effort
Effort
+
+
^=<LA+/=@<>AH++mmmmmmmmmmmmmmmmmmmmmm+
+
+
&=>9E+-G=:;H++mmmmmmmmmmmmmmmmmmmmmmm+
RUBRIC FOR POSTER/BROCHURE/VIDEO/COMIC
BOOK
Name(s): _____________________________ Project: _________________ Period(s): ____
CRITERIA
QUALITY OF
INFORMATION
VISUAL NEATNESS AND
ORGANIZATION
CREATIVITY
TECHNICAL ASPECTS
(GRAMMAR/SPELLING,
ETC.)
REFERENCES
POINTS
0-11
Information
does not relate
to the task and
is difficult to
follow.
12-17
Information is
somewhat related
to the task.
0-11
Project is very
messy and
unorganized.
Very little effort
is perceived.
12-17
Project is a little
messy and/or
unorganized.
Some effort is
perceived.
0-3
Project shows
no creative
thought in
presentation.
4-9
Project displays
some creative
thought.
0-4
Many technical
mistakes (more
than three).
5-7
Two to three
technical
mistakes.
0
No references
4-7
Some type of
reference and
documentation.
18-23
Information
presented is
relative to task
and
information is
somewhat easy
to understand.
18-23
Project is fairly
neat and
organized. A
good amount of
effort is
perceived.
10-15
Project is
creative and
relevant to the
task. (Creative
Flare)
8
One technical
mistake.
24-30
Information
presented is
very relative to
task and
information is
very easy to
understand.
24-30
Project is very
neat and
organized. A
great deal of
effort is
perceived.
16-20
Very creative
and relevant to
the task. A very
unique
presentation.
10
No technical
mistakes.
8
At least two
quality
references.
10
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.
! i) = nr(sin!
! r) ! 1.473 (sin 26º) = 2.20(sin!
! r) ! (sin!
! r) = (0.646)/2.20 ! ! r = sin-1 (0.294) =
ni (sin!
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.
2. An object is placed 6 cm in front of a converging lens of focal length 12 cm. Find the
image distance and the magnification. Describe the image.
3. An object is placed 15 cm in front of a converging lens of focal length 5 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. 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.
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
2. An object is placed 6 cm in front of a converging lens of focal length 12 cm. Find the
image distance and the magnification. Describe the image.
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
3. An object is placed 15 cm in front of a converging lens of focal length 5 cm. Find the
image distance and the magnification. Describe the image.
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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+
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+
9Q b@=E;>+
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+
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+
9Q ! @+o+6+
DQ ! @+e+!
! :++
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KQ D=>B+C;K@9+CLA>+D;+>:9<AJ9:;<>+
+
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S@EE+>B;+E;>>;:A+9JJ;9:+SB;<+A;;<+P:=C+9D=?;n+!;P:9G>@?;+@<K;i+=P+FE9AA+e+7WTW+
+
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+
+
+
+
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+
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@C9F;+=P+>B;+AYN+>L:<;K+LJA@K;2K=S<W+
+
9Q '<P;:@=:+C@:9F;+
DQ -LJ;:@=:+C@:9F;+
GQ -@<Y@<F+C@:9F;+
KQ &=S;:@<F+C@:9F;+
+
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+
9Q b@:>L9E*+@<?;:>;K+
DQ b@:>L9E*+LJ:@FB>+
GQ !;9E*+LJ:@FB>+
KQ !;9E*+@<?;:>;K+
+
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mmmmmmmmmmmmmmmmmmmmW+
+
9Q %B:=C9>=F:9JB+
DQ $GB:=C9>@G+E;<A+
GQ %B:=C9>@G+9D;::9>@=<+
KQ %B:=C9>@G+AJ;GLE9>@=<+
+
dW #@<K+>B;+G:@>@G9E+9<FE;+P=:+E@FB>+>:9?;E@<F+P:=C+@G;+M<+e+7WZ6dQ+@<>=+9@:W+
+
9Q _dW]=+
DQ d6=+
GQ 7WZ=+
KQ >B;:;+@A+<=+G:@>@G9E+9<FE;+
+
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>B;+K@A>9<G;+P:=C+>B;+=DI;G>+>=+>B;+E;<A+@A+Z`+GC*+SB9>+@A+>B;+K@A>9<G;+P:=C+>B;+@C9F;+>=+>B;+E;<An+
+
9Q Ta+GC+
DQ j6W6a+GC+
GQ j7ZW`+GC+
KQ 6W65+GC+
+
!"#!$%&'()+^()3-+!(3).+
4:=LJ+1;CD;:+)9C;AH+mmmmmmmmmmmmmmmmmmmmmmmmmmmmm+.9>;H++mmmmmmmmm/;:@=KH++mmmm+
4:=LJ+pH++mmmmmmmmm+
7W XB9>+@A+>B;+)=:C9E+E@<;n+++
+
+
5W XB;<+K=;A+E@FB>+D;<K+>=S9:KA+>B;+<=:C9En+
+
+
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+
+
_W $+P:@;<K+>B:=SA+9+G=@<+@<>=+9+J==EW++c=L+GE=A;+N=L+;N;A+9<K+K@?;+>=S9:K+>B;+AJ=>+SB;:;+N=L+A9S+@>+
P:=C+>B;+;KF;+=P+>B;+J==EW++XB;<+N=L+:;9GB+>B;+D=>>=C*+S@EE+>B;+G=@<+D;+@<+P:=<>+=P+N=L+=:+D;B@<K+
N=Ln+
+
+
+
TW #@<K+>B;+@C9F;+J=A@>@=<+9<K+>B;+C9F<@P@G9>@=<+P=:+9<+=DI;G>+JE9G;K+Z+GC+=L>A@K;+>B;+P=G9E+J=@<>+=P+9+
G=<?;:F@<F+E;<A+S@>B+9+_+GC+P=G9E+E;<F>BW++.;AG:@D;+>B;+@C9F;W+
+
+
+
+
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:;P:9G>@?;+@<K;i+=P+7WZZW+$+:9N+=P+E@FB>+>:9?;E@<F+@<+>B;+S9>;:+A>:@Y;A+>B;+FE9AA+9>+]6q+:;E9>@?;+>=+>B;+
<=:C9E*+9<K+>:9?;EA+>B:=LFB+>B;+J9<;W+XB9>+9<FE;*+:;E9>@?;+>=+>B;+<=:C9E*+S@EE+>B;+:9N+=P+E@FB>+D;<K+
:;E9>@?;+>=+>B;+<=:C9E+@<A@K;+>B;+FE9AAn+
!
!
!
!
!
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4:=LJ+1;CD;:+)9C;AH+mmmmmmmmmmmmmmmmmmmmmmmmmmmmm+.9>;H++mmmmmmmmm/;:@=KH++mmmm+
4:=LJ+pH++mmmmmmmmm+
+
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+
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+
! +7WZZZ+e+MZ+"+]+CfAQf?+!
! +?+e+MZ+"+]+CfAQf7WZZZ+e+5W5T+"+]+CfA+
<+e+Gf?+!
_W $+P:@;<K+>B:=SA+9+G=@<+@<>=+9+J==EW++c=L+GE=A;+N=L+;N;A+9<K+K@?;+>=S9:K+>B;+AJ=>+SB;:;+N=L+A9S+@>+
P:=C+>B;+;KF;+=P+>B;+J==EW++XB;<+N=L+:;9GB+>B;+D=>>=C*+S@EE+>B;+G=@<+D;+@<+P:=<>+=P+N=L+=:+D;B@<K+
N=Ln+
+
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G=<?;:F@<F+E;<A+S@>B+9+_+GC+P=G9E+E;<F>BW++.;AG:@D;+>B;+@C9F;W+
+
1/p + 1/q = 1/f ! q = (1/4 cm – 1/7 cm)-1 ! q = +9.33 cm
M = -q/p ! - (+9.33 cm)/(7 cm) ! -1.33
Real, inverted, magnified
+
`W -LJJ=A;+9+J9<;+=P+PE@<>+FE9AA*+S@>B+9+:;P:9G>@?;+@<K;i+=P+7W`T*+@A+@CC;:A;K+@<+S9>;:*+SB@GB+B9A+9+
:;P:9G>@?;+@<K;i+=P+7WZZZW+$+:9N+=P+E@FB>+>:9?;E@<F+@<+>B;+S9>;:+A>:@Y;A+>B;+FE9AA+9>+]6q+:;E9>@?;+>=+>B;+
<=:C9E*+9<K+>:9?;EA+>B:=LFB+>B;+J9<;W+XB9>+9<FE;*+:;E9>@?;+>=+>B;+<=:C9E*+S@EE+>B;+:9N+=P+E@FB>+D;<K+
:;E9>@?;+>=+>B;+<=:C9E+@<A@K;+>B;+FE9AAn+
!
!
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?
! i) = nr(sin!
! r) ! 1(sin38o) = 1.333(sin!
! r) ! ! r = sin-1 (0.616/1.333) = 27.5º
ni(sin!
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