Question 1

A 2.5 cm tall object is placed along the principal axis of a thin convex lens of 16 cm focal length.If the object distance is 29 cm,which of the following best describes the image distance and height,respectively?

Accepted Answer

A)   10 cm and 5.6 cm
B)   36 cm and 3.1 cm
C)   10 cm and 8.7 cm
D)   24 cm and 5.6 cm
E)   ​69 cm and 2.0 cmF) None of the above
G) A) and E)

Question 2

A projector lens is needed to form an image on a screen 10 times the size of its corresponding object.The screen is located 6.0 m from the lens.What is the required focal length of the lens?

Accepted Answer

A)   0.60 m
B)   5.5 m
C)   0.55 m
D)   0.30 m
E)   ​0.67 mF) B) and C)
G) B) and D)

Question 3

A concave mirror with focal length 17.0 cm is placed 38.0 cm to the left of the object.A convex lens of focal length 18.0 cm is placed 54.0 cm to the right of the object.Where is the image formed by both the mirror and the lens?

Accepted Answer

A)   13.9 cm to the right of the object
B)   25.5 cm to the right of the lens
C)   67.9 cm to the right of the object
D)   43.4 cm to the right of the lens
E)   ​17.0 cm to the right of the lensF) A) and B)
G) C) and D)

Question 4

An object is placed 10 cm in front of a mirror,and an image is formed that has a magnification of 2.Which of the following statements is false?

Accepted Answer

A)   The focal length of the mirror is 20 cm.
B)   The image is virtual.
C)   There is enough information to select the correct answer.
D)   This is the only true statement.E) B) and D)
F) All of the above

Question 5

A container is filled with fluid 1,and the apparent depth of the fluid is 8.00 cm.The container is next filled with fluid 2,and the apparent depth of this fluid is 6.00 cm.If the index of refraction of the first fluid is 1.30,what is the index of refraction of the second fluid?

Accepted Answer

A)   1.73
B)   2.28
C)   1.50
D)   1.13
E)   ​More information is needed to find the value.F) B) and E)
G) All of the above

Question 6

If atmospheric refraction did not occur,how would the apparent time of sunrise and sunset be changed?

Accepted Answer

A)   Both would be later.
B)   Both would be earlier.
C)   Sunrise would be later and sunset earlier.
D)   Sunrise would be earlier and sunset later.E) C) and D)
F) A) and B)

Question 7

An object is placed 10 cm in front of a mirror,and an image is formed that has a magnification of 2.Which of the following statements is true?

Accepted Answer

A)   The focal length of the mirror is 30 cm.
B)   The image is real.
C)   There is not enough information to select the correct answer.
D)   This is the only false statement.E) B) and C)
F) B) and D)

Question 8

If a virtual image is formed along the principal axis 9 cm from a concave mirror with the focal length 16 cm,what is the object distance from the mirror?

Accepted Answer

A)   7.0 cm
B)   21 cm
C)   17 cm
D)   5.8 cm
E)   ​4.9 cmF) D) and E)
G) C) and E)

Question 9

You stand six feet away from a plane mirror.How far is it from you to your image?

Accepted Answer

A)   6 ft
B)   7 ft
C)   12 ft
D)   3 ft
E)   ​24 ftF) A) and C)
G) C) and D)

Question 10

What is the image distance of an object 1.30 m in front of a converging lens of focal length 20.0 cm?

Accepted Answer

A)   + 17.3 cm
B)   -1.39 cm
C)   + 23.6 cm
D)   + 110 cm
E)   ​+ 4.2 cmF) A) and E)
G) A) and C)

Question 11

A convex mirror with focal length of -26 cm forms an image 15 cm behind the surface.Where is the object located as measured from the surface?

Accepted Answer

A)   9.1 cm
B)   11 cm
C)   9.5 cm
D)   35 cm
E)   ​15 cmF) B) and C)
G) A) and E)

Question 12

When the reflection of an object is seen in a plane mirror,the image is:

Accepted Answer

A)   real and upright.
B)   real and inverted.
C)   virtual and upright.
D)   virtual and inverted.E) None of the above
F) A) and D)

Question 13

Reducing the lens aperture size is a scheme one can use to reduce the occurrence of which of the following effects?

Accepted Answer

A)   spherical aberration
B)   mirages
C)   chromatic aberration
D)   light scatteringE) B) and C)
F) A) and B) A

Question 14

A thin lens has a focal length of 10.00 cm for red light.If the index of refraction for the lens material tends to decrease with increasing wavelength,what is the focal length of the lens for blue light?

Accepted Answer

A)   also 10.00 cm
B)   less that 10.00 cm
C)   more than 10.00 cm
D)   It depends on whether the lens is converging or diverging.E) A) and B)
F) A) and C)

Question 15

Two thin lenses with focal lengths 23.0 cm and 33.0 cm are placed in contact in an orientation so that their optic axes coincide.What is the focal length of the two in combination? (Hint: A thin lens is one whose thickness is negligible) .

Accepted Answer

A)   13.6 cm
B)   28.0 cm
C)   75.9 cm
D)   56.0 cm
E)   ​7.0 cmF) B) and E)
G) A) and C) A

Question 16

A concave mirror forms a real image at 29.0 cm from the mirror surface along the principal axis.If the corresponding object is at a 10.0-cm distance,what is the mirror's focal length?

Accepted Answer

A)   19.0 cm
B)   39.0 cm
C)   13.4 cm
D)   7.44 cm
E)   ​15.3 cmF) B) and E)
G) A) and D) D

Question 17

An object is held at a distance of 23 cm from a convex mirror creating an image that is 1/4 the object size.What is the focal length of the mirror?

Accepted Answer

A)   -7.7 cm
B)   17 cm
C)   -4.6 cm
D)   -4.8 cm
E)   ​31 cmF) A) and B)
G) A) and C)

Question 18

An object 6 cm high is placed 18 cm in front of a mirror.What type of mirror and what radius of curvature is needed for an image that is upright and 16 cm tall?

Accepted Answer

A)   Concave,R = 58 cm
B)   Concave,R = 7 cm
C)   Convex,R = -7 cm
D)   Convex,R = -26 cm
E)   ​Concave,R = 29 cmF) B) and D)
G) C) and D)

Question 19

A 80-cm focal length thin lens is placed in contact with one of 59.2 cm focal length.An object is placed 51 cm in front of the combination.What is the image distance?

Accepted Answer

A)   20.0 cm
B)   191 cm
C)   42.0 cm
D)   102 cm
E)   ​25.5 cmF) A) and D)
G) C) and E)

Question 20

A fused combination of a diverging and converging lens pair each made from a different index of refraction glass,is used to reduce the occurrence of which of the following effects?

Accepted Answer

A)   spherical aberration
B)   mirages
C)   chromatic aberration
D)   light scatteringE) A) and D)
F) None of the above

Exam 23: Mirrors and Lenses

A 2.5 cm tall object is placed along the principal axis of a thin convex lens of 16 cm focal length.If the object distance is 29 cm,which of the following best describes the image distance and height,respectively?

Correct AnswerverifiedShow Answer

A projector lens is needed to form an image on a screen 10 times the size of its corresponding object.The screen is located 6.0 m from the lens.What is the required focal length of the lens?

Correct AnswerverifiedShow Answer

A concave mirror with focal length 17.0 cm is placed 38.0 cm to the left of the object.A convex lens of focal length 18.0 cm is placed 54.0 cm to the right of the object.Where is the image formed by both the mirror and the lens?

Correct AnswerverifiedShow Answer

An object is placed 10 cm in front of a mirror,and an image is formed that has a magnification of 2.Which of the following statements is false?

Correct AnswerverifiedShow Answer

A container is filled with fluid 1,and the apparent depth of the fluid is 8.00 cm.The container is next filled with fluid 2,and the apparent depth of this fluid is 6.00 cm.If the index of refraction of the first fluid is 1.30,what is the index of refraction of the second fluid?

Correct AnswerverifiedShow Answer

If atmospheric refraction did not occur,how would the apparent time of sunrise and sunset be changed?

Correct AnswerverifiedShow Answer

An object is placed 10 cm in front of a mirror,and an image is formed that has a magnification of 2.Which of the following statements is true?

Correct AnswerverifiedShow Answer

If a virtual image is formed along the principal axis 9 cm from a concave mirror with the focal length 16 cm,what is the object distance from the mirror?

Correct AnswerverifiedShow Answer

You stand six feet away from a plane mirror.How far is it from you to your image?

Correct AnswerverifiedShow Answer

What is the image distance of an object 1.30 m in front of a converging lens of focal length 20.0 cm?

Correct AnswerverifiedShow Answer

A convex mirror with focal length of -26 cm forms an image 15 cm behind the surface.Where is the object located as measured from the surface?

Correct AnswerverifiedShow Answer

When the reflection of an object is seen in a plane mirror,the image is:

Correct AnswerverifiedShow Answer

Reducing the lens aperture size is a scheme one can use to reduce the occurrence of which of the following effects?

Correct AnswerverifiedA

A thin lens has a focal length of 10.00 cm for red light.If the index of refraction for the lens material tends to decrease with increasing wavelength,what is the focal length of the lens for blue light?

Correct AnswerverifiedShow Answer

Two thin lenses with focal lengths 23.0 cm and 33.0 cm are placed in contact in an orientation so that their optic axes coincide.What is the focal length of the two in combination? (Hint: A thin lens is one whose thickness is negligible) .

Correct AnswerverifiedA

A concave mirror forms a real image at 29.0 cm from the mirror surface along the principal axis.If the corresponding object is at a 10.0-cm distance,what is the mirror's focal length?

Correct AnswerverifiedD

An object is held at a distance of 23 cm from a convex mirror creating an image that is 1/4 the object size.What is the focal length of the mirror?

Correct AnswerverifiedShow Answer

An object 6 cm high is placed 18 cm in front of a mirror.What type of mirror and what radius of curvature is needed for an image that is upright and 16 cm tall?

Correct AnswerverifiedShow Answer

A 80-cm focal length thin lens is placed in contact with one of 59.2 cm focal length.An object is placed 51 cm in front of the combination.What is the image distance?

Correct AnswerverifiedShow Answer

A fused combination of a diverging and converging lens pair each made from a different index of refraction glass,is used to reduce the occurrence of which of the following effects?

Correct AnswerverifiedShow Answer

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