Question 1

When an object is 12 cm in front of a concave mirror, the image is 3.0 cm in front of the mirror? What is the focal length of the mirror?

Accepted Answer

A)   -0.25 cm
B)   -1.3 cm
C)   2.4 cm
D)   15 cm
E)   4.0 cmF) B) and C)
G) A) and B)

Question 2

If the index of refraction of a material is 2, this means that light travels

Accepted Answer

A)   2 times as fast in air as it does in vacuum.
B)   2 times as fast in vacuum as it does in the material.
C)   2 times as fast in the material as it does in air.
D)   1/2 as fast in air as it does in the material.
E)   2 times as fast in the material than it does in vacuum.F) A) and B)
G) C) and E)

Question 3

A plant that is 4.1 cm tall is 10.3 cm from a converging lens. You observe that the image of this plant is virtual and 6.2 cm tall. What is the focal length of the lens?

Accepted Answer

A)   30 cm
B)   6.8 cm
C)   16 cm
D)   -30 cm
E)   -16 cmF) C) and D)
G) A) and C)

Question 4

When an object is placed 118 cm from a thin diverging lens, its image is found to be 59 cm
from the lens. The lens is removed, and replaced by a thin converging lens whose focal
length has the same magnitude as the diverging lens. This second lens is at the original
position of the first lens. Where is the image of the object now?

Accepted Answer

The answer of When an object is placed 118 cm...

Question 5

A ray of light (ray $a$ ) in air strikes a flat piece of glass at an angle of $\phi _ { 0 } = 84 ^ { \circ }$ with respect to the normal, as shown in the figure. The index of refraction of the glass is $1.5$. What is the angle $\theta$ between the reflected ray (ray $b$ ) and refracted ray (ray $c$ ) rays?

Accepted Answer

The answer of A ray of light (ray $a$ )...

Question 6

The image formed by a single concave lens

Accepted Answer

A)   is always inverted.
B)   could be real or virtual, depending on whether the object distance is smaller or greater than the focal length.
C)   is always virtual.
D)   could be real or virtual, but is always real when the object is placed at the focal point.
E)   is always real.F) A) and B)
G) C) and D)

Question 7

A plastic cube is immersed in water having an index of refraction of $1.33$. A laser beam in the plastic strikes the interface at an angle of $14.5 ^ { \circ }$ with the normal in the plastic. In the water, this beam makes an angle of $21.8 ^ { \circ }$ with the normal. What is the speed of light in the plastic cube? $\left( c = 3.0 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } \right)$

Accepted Answer

The answer of A plastic cube is immersed in water...

Question 8

A light beam has speed  ccc  in vacuum and speed  vvv  in a certain plastic. The index of refraction  nnn  of this plastic is

Accepted Answer

A)    n=(c/v) 2n = ( c / v )  ^ { 2 }n=(c/v) 2 .
B)    n=c/vn = c / vn=c/v .
C)    n=(v/c) 2n = ( v / c )  ^ { 2 }n=(v/c) 2 .
D)    n=v/cn = v / cn=v/c .
E)    n=cvn = c vn=cv . F) A) and B)
G) A) and D)

Question 9

A beam of light, traveling in air, strikes a plate of transparent material at an angle of incidence of  56.0∘56.0 ^ { \circ }56.0∘ . It is observed that the reflected and refracted beams form an angle of  90.0∘90.0 ^ { \circ }90.0∘ . What is the index of refraction of this material?

Accepted Answer

A)    1.481.481.48 
B)    1.431.431.43 
C)    1.441.441.44 
D)    1.401.401.40E) None of the above
F) B) and D)

Question 10

A convex lens has focal length  fff . If an object is placed at a distance between  fff  and  2f2 f2f  from the lens on the principal axis, the image is located at a distance from the lens

Accepted Answer

A)   that is greater than  2f2 f2f .
B)   of infinity.
C)   of  2f2 f2f .
D)   between  fff  and  2f2 f2f .
E)   of  fff . F) A) and C)
G) A) and E)

Question 11

A negative magnification for a mirror means that

Accepted Answer

A)   the image is inverted, and the mirror is concave.
B)   the image is upright, and the mirror could be either concave or convex.
C)   the image is inverted, and the mirror is convex.
D)   the image is inverted, and the mirror could be either concave or convex.
E)   the image is upright, and the mirror is convex.F) A) and E)
G) A) and C)

Question 12

A scuba diver is  1.2 m1.2 \mathrm {~m}1.2 m  beneath the surface of a still pond of water. At what angle relative to the normal at the surface must the diver shine a beam of light toward the surface in order for a person on a distant bank to be able to see it? The index of refraction for water is  1.331.331.33 .

Accepted Answer

A)    41∘41 ^ { \circ }41∘ 
B)    90∘90 ^ { \circ }90∘ 
C)    59∘59 ^ { \circ }59∘ 
D)    0∘0 ^ { \circ }0∘ 
E)    48∘48 ^ { \circ }48∘F) A) and B)
G) C) and D)

Question 13

An object is placed on the left side of a thin lens, and the image of this object is formed on the left side of the lens. Which of the following statements must be true? (There could be more than one
Correct choice.)

Accepted Answer

A)   The image is inverted and real.
B)   The lens must be a converging lens, and the image is upright.
C)   The image is upright and virtual.
D)   The lens could be either a converging or a diverging lens, and the image is upright.
E)   The lens must be a diverging lens, and the image is upright.F) A) and B)
G) C) and E)

Question 14

A thin double-convex lens is intended to focus the image of an object onto a screen so that the image is life-sized on the screen. The lens has equal-magnitude radii of  83 cm83 \mathrm {~cm}83 cm  and a refractive index of 1.6.
(a)  What is the distance  ddd  from the image to the screen?
(b)  What is the total distance  LLL  between the object and the image?

Accepted Answer

A)   (a)   d=69 cmd = 69 \mathrm {~cm}d=69 cm (b)   L=35 cmL = 35 \mathrm {~cm}L=35 cm 
B)   (a)   d=138 cmd = 138 \mathrm {~cm}d=138 cm (b)   L=276 cmL = 276 \mathrm {~cm}L=276 cm 
C)   (a)   d=−138 cmd = - 138 \mathrm {~cm}d=−138 cm (b)   L=−276 cmL = - 276 \mathrm {~cm}L=−276 cm 
D)    (a) d=276 cm( \mathrm { a } )  d = 276 \mathrm {~cm}(a) d=276 cm (b)   L=552 cmL = 552 \mathrm {~cm}L=552 cmE) A) and B)
F) B) and C)

Question 15

You may have seen ambulances on the street with the letters of the word AMBULANCE written on the front of them, in such a way as to appear correctly when viewed in your car's rear-view
Mirror. (See the figure.)  How do the letters appear when you look directly at the ambulance (not
Through the mirror) ? a)   ∀\forall∀  WดกาซNวE
b)   MB∪⊥АИว∃\mathrm { MB } \cup \perp А И ว \existsMB∪⊥АИว∃ 
c)  ECNALUBMA
d)   ∃วN∀า∩&W∀\exists ว N \forall า \cap \& W \forall∃วN∀า∩&W∀ 
e)  ヨวИA」บดMA

Accepted Answer

A)    a\mathrm { a }a 
B)    bbb 
C)    c\mathrm { c }c 
D)    d\mathrm { d }d 
E)   e F) A) and E)
G) A) and C)

Question 16

A drawing is placed  40 cm40 \mathrm {~cm}40 cm  in front of a thin lens. If a virtual image forms at a distance of  50 cm50 \mathrm {~cm}50 cm  from the lens, on the same side as the drawing, what is the focal length of the lens?

Accepted Answer

A)    −45 cm- 45 \mathrm {~cm}−45 cm 
B)    +45 cm+ 45 \mathrm {~cm}+45 cm 
C)    75 cm75 \mathrm {~cm}75 cm 
D)    90 cm90 \mathrm {~cm}90 cm 
E)    200 cm200 \mathrm {~cm}200 cmF) None of the above
G) A) and B)

Question 17

The critical angle for a beam of light passing from water into air is 48.8°. This means that all light rays with an angle of incidence in the water that is greater than 48.8° will be

Accepted Answer

A)   totally reflected.
B)   partially reflected and partially transmitted.
C)   totally transmitted.
D)   totally absorbed by the water.E) None of the above
F) B) and C)

Question 18

A 4.0-cm tall object is placed 60 cm in front of a converging lens of focal length of magnitude 30 cm. What are the nature and location of the image?

Accepted Answer

A)   The image is virtual, 2.5 cm tall, 30 cm on the other side of the lens.
B)   The image is virtual, 4.0 cm tall, 60 cm on the same side as object.
C)   The image is virtual, 2.0 cm tall, 15 cm on the other side of the lens.
D)   The image is real, 2.5 cm tall, 30 cm on the same side as object.
E)   The image is real, 4.0 cm tall, 60 cm on the other side of the lens.F) A) and D)
G) A) and E)

Question 19

An object is placed 21 cm from a concave lens having a focal length of magnitude 25 cm. What is the magnification?

Accepted Answer

A)   -0.32
B)   -0.22
C)   0.22
D)   -0.54
E)   0.54F) B) and C)
G) C) and D)

Question 20

An object is placed 15 cm from a spherical concave mirror with a focal length of magnitude 20 cm. If the object is 4.0 cm tall, how tall is the image?

Accepted Answer

A)   2.0 cm
B)   16 cm
C)   1.0 cm
D)   8.0 cmE) None of the above
F) B) and C)

Exam 22: Electromagnetic Waves

The critical angle for a beam of light passing from water into air is 48.8°. This means that all light rays with an angle of incidence in the water that is greater than 48.8° will be

Correct Answer
verified

An object is placed on the left side of a thin lens, and the image of this object is formed on the left side of the lens. Which of the following statements must be true? (There could be more than one Correct choice.)

Correct Answer
verified

An object is placed 21 cm from a concave lens having a focal length of magnitude 25 cm. What is the magnification?

Correct Answer
verified

A 4.0-cm tall object is placed 60 cm in front of a converging lens of focal length of magnitude 30 cm. What are the nature and location of the image?

Correct Answer
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A negative magnification for a mirror means that

Correct Answer
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A beam of light, traveling in air, strikes a plate of transparent material at an angle of incidence of $56.0 ^ { \circ }$ . It is observed that the reflected and refracted beams form an angle of $90.0 ^ { \circ }$ . What is the index of refraction of this material?

Correct Answer
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An object is placed 15 cm from a spherical concave mirror with a focal length of magnitude 20 cm. If the object is 4.0 cm tall, how tall is the image?

Correct Answer
verified

A convex lens has focal length $f$ . If an object is placed at a distance between $f$ and $2 f$ from the lens on the principal axis, the image is located at a distance from the lens

Correct Answer
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When an object is 12 cm in front of a concave mirror, the image is 3.0 cm in front of the mirror? What is the focal length of the mirror?

Correct Answer
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Correct Answer
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Correct Answer
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A drawing is placed $40 \mathrm {~cm}$ in front of a thin lens. If a virtual image forms at a distance of $50 \mathrm {~cm}$ from the lens, on the same side as the drawing, what is the focal length of the lens?

Correct Answer
verified

A scuba diver is $1.2 \mathrm {~m}$ beneath the surface of a still pond of water. At what angle relative to the normal at the surface must the diver shine a beam of light toward the surface in order for a person on a distant bank to be able to see it? The index of refraction for water is $1.33$ .

Correct Answer
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Correct Answer
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If the index of refraction of a material is 2, this means that light travels

Correct Answer
verified

A plant that is 4.1 cm tall is 10.3 cm from a converging lens. You observe that the image of this plant is virtual and 6.2 cm tall. What is the focal length of the lens?

Correct Answer
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Correct Answer
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The image formed by a single concave lens

Correct Answer
verified

Correct Answer
verified

A light beam has speed $c$ in vacuum and speed $v$ in a certain plastic. The index of refraction $n$ of this plastic is

Correct Answer
verified

Exam 22: Electromagnetic Waves

The critical angle for a beam of light passing from water into air is 48.8°. This means that all light rays with an angle of incidence in the water that is greater than 48.8° will be

Correct AnswerverifiedShow Answer

An object is placed on the left side of a thin lens, and the image of this object is formed on the left side of the lens. Which of the following statements must be true? (There could be more than one Correct choice.)

Correct AnswerverifiedShow Answer

An object is placed 21 cm from a concave lens having a focal length of magnitude 25 cm. What is the magnification?

Correct AnswerverifiedShow Answer

A 4.0-cm tall object is placed 60 cm in front of a converging lens of focal length of magnitude 30 cm. What are the nature and location of the image?

Correct AnswerverifiedShow Answer

A negative magnification for a mirror means that

Correct AnswerverifiedShow Answer

A beam of light, traveling in air, strikes a plate of transparent material at an angle of incidence of 56.0∘56.0 ^ { \circ }56.0∘ . It is observed that the reflected and refracted beams form an angle of 90.0∘90.0 ^ { \circ }90.0∘ . What is the index of refraction of this material?

Correct AnswerverifiedShow Answer

An object is placed 15 cm from a spherical concave mirror with a focal length of magnitude 20 cm. If the object is 4.0 cm tall, how tall is the image?

Correct AnswerverifiedShow Answer

A convex lens has focal length fff . If an object is placed at a distance between fff and 2f2 f2f from the lens on the principal axis, the image is located at a distance from the lens

Correct AnswerverifiedShow Answer

When an object is 12 cm in front of a concave mirror, the image is 3.0 cm in front of the mirror? What is the focal length of the mirror?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A drawing is placed 40 cm40 \mathrm {~cm}40 cm in front of a thin lens. If a virtual image forms at a distance of 50 cm50 \mathrm {~cm}50 cm from the lens, on the same side as the drawing, what is the focal length of the lens?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

If the index of refraction of a material is 2, this means that light travels

Correct AnswerverifiedShow Answer

A plant that is 4.1 cm tall is 10.3 cm from a converging lens. You observe that the image of this plant is virtual and 6.2 cm tall. What is the focal length of the lens?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The image formed by a single concave lens

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A light beam has speed ccc in vacuum and speed vvv in a certain plastic. The index of refraction nnn of this plastic is

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

A beam of light, traveling in air, strikes a plate of transparent material at an angle of incidence of $56.0 ^ { \circ }$ . It is observed that the reflected and refracted beams form an angle of $90.0 ^ { \circ }$ . What is the index of refraction of this material?

Correct Answer
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Correct Answer
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A convex lens has focal length $f$ . If an object is placed at a distance between $f$ and $2 f$ from the lens on the principal axis, the image is located at a distance from the lens

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

A drawing is placed $40 \mathrm {~cm}$ in front of a thin lens. If a virtual image forms at a distance of $50 \mathrm {~cm}$ from the lens, on the same side as the drawing, what is the focal length of the lens?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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A light beam has speed $c$ in vacuum and speed $v$ in a certain plastic. The index of refraction $n$ of this plastic is

Correct Answer
verified