Question 1

When a human eye that has a power of +60 D is fitted with a contact lens of -10 D, the equivalent lens combination is

Accepted Answer

A)   diverging and of focal length 2 cm.
B)   converging and of focal length 50 cm.
C)   converging and of focal length 2 cm.
D)   focal length 0.02 cm.
E)   focal length 0.2 cm.F) B) and E)
G) None of the above

Question 2

When an object is closer to a convex mirror than the mirror's focal point, the

Accepted Answer

A)   magnification is less than one.
B)   image distance is greater than the object distance.
C)   magnification is equal to one.
D)   image is real.
E)   image is inverted.F) A) and E)
G) A) and B)

Question 3

2 is greater than n1? A)  The object distance is greater than the image distance. B)  The image distance may be positive or negative. C)  The radius of curvature is negative. D)  The magnitude of the magnification is less than one. E)  The object distance is positive." class="answers-bank-image d-inline" rel="preload" > Which of the following statements about the figure is correct when the index of refraction n2 is greater than n1?

Accepted Answer

A)   The object distance is greater than the image distance.
B)   The image distance may be positive or negative.
C)   The radius of curvature is negative.
D)   The magnitude of the magnification is less than one.
E)   The object distance is positive.F) A) and B)
G) C) and E)

Question 4

The image produced by the converging lens is at point

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5F) D) and E)
G) A) and D)

Question 5

A person uses two microscopes to view the same object. Microscope A is twice as long as microscope B and contains lenses with focal lengths that are one-half those of B. If microscope A provides a magnification of m, then what magnification does B provide?

Accepted Answer

A)   m
B)   2m
C)   m/2
D)   8m
E)   m/8F) C) and D)
G) A) and B)

Question 6

Your farsighted girlfriend requires lenses with a power of 1.67 diopters to read comfortably from a book that is 25.0 cm from her eyes. What is her near point without the lenses?

Accepted Answer

A)   17.6 cm
B)   4.00 cm
C)   59.9 cm
D)   42.9 cm
E)   36.2 cmF) C) and D)
G) A) and E)

Question 7

A concave (diverging)  lens can produce an image that is

Accepted Answer

A)   virtual, inverted, and magnified.
B)   real, erect, and magnified.
C)   diminished, erect, and virtual.
D)   magnified, erect, and virtual.
E)   diminished, real, and erect.F) B) and E)
G) B) and C)

Question 8

A diverging lens has a focal length of magnitude 20 cm. An object is placed 10 cm in front of the diverging lens. Calculate the magnitude of the distance of the image to the lens.

Accepted Answer

A)   10 cm
B)   20 cm
C)   6.7 cm
D)   5.2 cm
E)   8.5 cmF) C) and D)
G) B) and D)

Question 9

After passing through the thin converging lens, the two rays cross at point

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5F) A) and D)
G) C) and D)

Question 10

To provide large magnification, a telescope should have an objective with a _____ and an eyepiece with a _____.

Accepted Answer

A)   long focal length; short focal length
B)   long focal length; long focal length
C)   short focal length; short focal length
D)   short focal length; long focal length
E)   large diameter; short focal lengthF) None of the above
G) A) and B)

Question 11

Your microscope has an objective lens of focal length 1.20 cm and an eyepiece of focal length 2.40 cm separated by 16.0 cm. What is the magnifying power if your near point is 25.0 cm?

Accepted Answer

A)   150
B)   -150
C)   136
D)   -75
E)   -108F) C) and D)
G) A) and B)

Question 12

Two parallel rays are incident on a concave spherical mirror whose center of curvature is at 3. After being reflected, the two rays cross at point

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5F) B) and E)
G) A) and E)

Question 13

A person uses a simple magnifying glass to study faces on an old school photograph. If the person has a near point of 25 cm and the magnifying glass (which is held close to the eye)  has a focal length of 6 cm, then calculate the distance the photograph must be held in front of the magnifying glass.

Accepted Answer

A)   7.9 cm
B)   4.8 cm
C)   10.8 cm
D)   12.7 cm
E)   none of the aboveF) B) and E)
G) B) and C)

Question 14

When an object is farther from a concave mirror than twice the mirror's focal length, the

Accepted Answer

A)   magnification is less than one.
B)   image is inverted.
C)   image distance is less than the object distance.
D)   image is real.
E)   All of these are correct.F) All of the above
G) None of the above

Question 15

A simple magnifier gives a magnification of 8 times when it is used by a person with a normal near point (25 cm) . What is the magnifying power when it is used by a person whose near point is 15 cm?

Accepted Answer

A)   4.8
B)   13
C)   8.0
D)   15
E)   9.6F) A) and E)
G) A) and B)

Question 16

The resolving power of a telescope is a measure of the ability of the instrument to

Accepted Answer

A)   form a plane image of a plane object.
B)   produce a large image.
C)   eliminate aberrations.
D)   produce a bright image.
E)   form distinctly separate images of points close together on the object.F) C) and E)
G) A) and E)

Question 17

A two lens magnifying system uses lenses of focal lengths 2.5 and 9.5 cm for the objective and eyepiece respectively. The two lenses are positioned 23 cm apart. An object for study is placed 3.0 cm in front of the objective lens. Find the position of the final image relative to the eyepiece lens.

Accepted Answer

A)   -27.7 cm
B)   -50.7 cm
C)   15.0 cm
D)   -1.59 cm
E)   -35.3 cmF) C) and D)
G) A) and B)

Question 18

An object is placed 200 cm from a screen. When a converging lens is placed between the object and screen at a distance of 160 cm from the object, an image is formed on the screen. Without moving the object or screen, an image can also be formed on the screen when the distance from the object to the lens is

Accepted Answer

A)   8 cm
B)   16 cm
C)   20 cm
D)   32 cm
E)   40 cmF) None of the above
G) A) and B)

Question 19

Your nearsighted instructor cannot focus clearly on objects more distant than 150 cm from her eyes. What power lenses are required for her to see distant students clearly?

Accepted Answer

A)   1.5
B)   0.15
C)   0.67
D)   -0.67
E)   -1.5F) B) and D)
G) A) and B)

Question 20

A diverging lens has a focal length of magnitude 20 cm. An object is placed 10 cm in front of the diverging lens. Calculate the magnification of the image and whether it is upright or inverted.

Accepted Answer

A)   0.67 upright
B)   0.52 upright
C)   0.67 inverted
D)   1.5 upright
E)   0.85 invertedF) All of the above
G) A) and B)

Exam 12: Optical Images

Your farsighted girlfriend requires lenses with a power of 1.67 diopters to read comfortably from a book that is 25.0 cm from her eyes. What is her near point without the lenses?

Correct Answer
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Correct Answer
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Your microscope has an objective lens of focal length 1.20 cm and an eyepiece of focal length 2.40 cm separated by 16.0 cm. What is the magnifying power if your near point is 25.0 cm?

Correct Answer
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The image produced by the converging lens is at point

Correct Answer
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Two parallel rays are incident on a concave spherical mirror whose center of curvature is at 3. After being reflected, the two rays cross at point

Correct Answer
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When a human eye that has a power of +60 D is fitted with a contact lens of -10 D, the equivalent lens combination is

Correct Answer
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A diverging lens has a focal length of magnitude 20 cm. An object is placed 10 cm in front of the diverging lens. Calculate the magnification of the image and whether it is upright or inverted.

Correct Answer
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Your nearsighted instructor cannot focus clearly on objects more distant than 150 cm from her eyes. What power lenses are required for her to see distant students clearly?

Correct Answer
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When an object is closer to a convex mirror than the mirror's focal point, the

Correct Answer
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A person uses two microscopes to view the same object. Microscope A is twice as long as microscope B and contains lenses with focal lengths that are one-half those of B. If microscope A provides a magnification of m, then what magnification does B provide?

Correct Answer
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When an object is farther from a concave mirror than twice the mirror's focal length, the

Correct Answer
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A simple magnifier gives a magnification of 8 times when it is used by a person with a normal near point (25 cm) . What is the magnifying power when it is used by a person whose near point is 15 cm?

Correct Answer
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A person uses a simple magnifying glass to study faces on an old school photograph. If the person has a near point of 25 cm and the magnifying glass (which is held close to the eye) has a focal length of 6 cm, then calculate the distance the photograph must be held in front of the magnifying glass.

Correct Answer
verified

A concave (diverging) lens can produce an image that is

Correct Answer
verified

A two lens magnifying system uses lenses of focal lengths 2.5 and 9.5 cm for the objective and eyepiece respectively. The two lenses are positioned 23 cm apart. An object for study is placed 3.0 cm in front of the objective lens. Find the position of the final image relative to the eyepiece lens.

Correct Answer
verified

The resolving power of a telescope is a measure of the ability of the instrument to

Correct Answer
verified

After passing through the thin converging lens, the two rays cross at point

Correct Answer
verified

A diverging lens has a focal length of magnitude 20 cm. An object is placed 10 cm in front of the diverging lens. Calculate the magnitude of the distance of the image to the lens.

Correct Answer
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Correct Answer
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To provide large magnification, a telescope should have an objective with a _ and an eyepiece with a _.

Correct Answer
verified

Exam 12: Optical Images

Your farsighted girlfriend requires lenses with a power of 1.67 diopters to read comfortably from a book that is 25.0 cm from her eyes. What is her near point without the lenses?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Your microscope has an objective lens of focal length 1.20 cm and an eyepiece of focal length 2.40 cm separated by 16.0 cm. What is the magnifying power if your near point is 25.0 cm?

Correct AnswerverifiedShow Answer

The image produced by the converging lens is at point

Correct AnswerverifiedShow Answer

Two parallel rays are incident on a concave spherical mirror whose center of curvature is at 3. After being reflected, the two rays cross at point

Correct AnswerverifiedShow Answer

When a human eye that has a power of +60 D is fitted with a contact lens of -10 D, the equivalent lens combination is

Correct AnswerverifiedShow Answer

A diverging lens has a focal length of magnitude 20 cm. An object is placed 10 cm in front of the diverging lens. Calculate the magnification of the image and whether it is upright or inverted.

Correct AnswerverifiedShow Answer

Your nearsighted instructor cannot focus clearly on objects more distant than 150 cm from her eyes. What power lenses are required for her to see distant students clearly?

Correct AnswerverifiedShow Answer

When an object is closer to a convex mirror than the mirror's focal point, the

Correct AnswerverifiedShow Answer

A person uses two microscopes to view the same object. Microscope A is twice as long as microscope B and contains lenses with focal lengths that are one-half those of B. If microscope A provides a magnification of m, then what magnification does B provide?

Correct AnswerverifiedShow Answer

When an object is farther from a concave mirror than twice the mirror's focal length, the

Correct AnswerverifiedShow Answer

A simple magnifier gives a magnification of 8 times when it is used by a person with a normal near point (25 cm) . What is the magnifying power when it is used by a person whose near point is 15 cm?

Correct AnswerverifiedShow Answer

A person uses a simple magnifying glass to study faces on an old school photograph. If the person has a near point of 25 cm and the magnifying glass (which is held close to the eye) has a focal length of 6 cm, then calculate the distance the photograph must be held in front of the magnifying glass.

Correct AnswerverifiedShow Answer

A concave (diverging) lens can produce an image that is

Correct AnswerverifiedShow Answer

A two lens magnifying system uses lenses of focal lengths 2.5 and 9.5 cm for the objective and eyepiece respectively. The two lenses are positioned 23 cm apart. An object for study is placed 3.0 cm in front of the objective lens. Find the position of the final image relative to the eyepiece lens.

Correct AnswerverifiedShow Answer

The resolving power of a telescope is a measure of the ability of the instrument to

Correct AnswerverifiedShow Answer

After passing through the thin converging lens, the two rays cross at point

Correct AnswerverifiedShow Answer

A diverging lens has a focal length of magnitude 20 cm. An object is placed 10 cm in front of the diverging lens. Calculate the magnitude of the distance of the image to the lens.

Correct AnswerverifiedShow Answer

Which of the following statements about the figure is correct when the index of refraction n2 is greater than n1?

Correct AnswerverifiedShow Answer

To provide large magnification, a telescope should have an objective with a _____ and an eyepiece with a _____.

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
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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

To provide large magnification, a telescope should have an objective with a _ and an eyepiece with a _.

Correct Answer
verified