Question 1

A nearsighted person wears contact lenses having a power of -0.15 diopters.What is the person's uncorrected far point?

Accepted Answer

A)  1.5 m
B)  3.3 m
C)  6.0 m
D)  6.7 mE) A) and C)
F) B) and C)

Question 2

You have a choice between two lenses of focal lengths fa and fb,where fb = 2fa,to use as the objective lens in building a compound microscope.If the magnification you obtain using lens a is Ma,what will be the magnification when using lens b?

Accepted Answer

A)  Mb = 2 Ma
B)  Mb = 4 Ma
C)  Mb = 8 Ma
D)  Mb = Ma/4
E)  Mb = Ma/2F) None of the above
G) A) and B)

Question 3

Cal is viewing the Moon with his new telescope,using a 10-mm focal length eyepiece.For greater detail,he wishes to double the magnification of his telescope.An eyepiece having which one of the following characteristics will accomplish this for him?

Accepted Answer

A)  40 diopters
B)  8 mm
C)  12 mm
D)  200 diopters
E)  5 dioptersF) B) and E)
G) B) and D)

Question 4

What power contact lens should be used to correct the vision of a farsighted person whose near point is 80 cm so she can see things clearly that are 25 cm in front of her?

Accepted Answer

A)  +2.8 diopters
B)  -2.8 diopters
C)  -4.0 diopters
D)  -4.2 diopters
E)  +4.2 dioptersF) B) and C)
G) A) and B)

Question 5

A farsighted boy has a near point at 2.3 m and requires contact lenses to correct his vision to the normal near point.What is the correct choice of lens power for the contact lenses?

Accepted Answer

A)  -0.28 diopters
B)  +0.28 diopters
C)  -3.6 diopters
D)  +3.6 diopters
E)  +1.8 dioptersF) A) and B)
G) A) and C)

Question 6

A compound microscope consists of an objective lens of focal length f0 and an eyepiece that by itself produces an angular magnification 25.0.The microscope is designed so that the object to be viewed is on the left side of the objective lens and is focused in a plane that is 28.00 cm away from the right-hand (or inside)focal point of the objective lens.When properly adjusted,the eyepiece and the objective lens are 29.90 cm apart.The eyepiece magnification is based on an image at infinity and a near point at 25.0 cm.What is f0?

Accepted Answer

Question 7

The length of a telescope is 1.60 m and it has a magnification of 60.0.What is the focal length of the eyepiece?

Accepted Answer

A)  2.62 cm
B)  60.0 cm
C)  100 cm
D)  1.16 cm
E)  96.0 cmF) B) and E)
G) B) and C)

Question 8

The focal length of the objective lens of a telescope is 75.0 cm,and the eyepiece has a focal length of 6.00 cm.What is the magnification of this telescope?

Accepted Answer

A)  0.0800
B)  0.645
C)  450
D)  12.5
E)  200F) D) and E)
G) A) and B)

Question 9

Which one of the following is a characteristic of a compound microscope?

Accepted Answer

A)  The objective is a concave lens.
B)  The eyepiece is a concave lens.
C)  The final image is real.
D)  The image formed by the objective is virtual.
E)  The image formed by the objective is real.F) C) and D)
G) A) and D)

Question 10

A stature that is 3.0 cm tall statue is 24 cm in front of a concave mirror.The magnitude of the radius of curvature of the mirror is 20 cm.
(a)Is the image real or virtual?
(b)How far is the image from the mirror?
(c)Is the image upright or inverted?
(d)How tall is the image?

Accepted Answer

(a)real
(...

Question 11

A refracting telescope has an eyepiece of focal length -80 mm and an objective of focal length 36 cm.What is the magnification of this instrument?

Accepted Answer

The answer of A refracting telescope has an eyepiece of...

Question 12

You are given two converging lenses to build a compound microscope.Lens A has focal length 0.50 cm and lens B has focal length of 3.0 cm.Which one of the two lenses would you use for the objective?

Accepted Answer

A)  Lens A, because it has the shorter focal length.
B)  Lens B, because it has the longer focal length.
C)  It makes no difference which lens I use for the objective.
D)  None, because the objective should be a diverging lens.E) B) and C)
F) A) and D)

Question 13

A person cannot see clearly objects more than 70.0 cm away.What power of corrective lens should be prescribed if the glass is to be worn 1.00 cm in front of the eye?

Accepted Answer

A)  1.45 diopters
B)  -1.45 diopters
C)  0.0145 diopters
D)  -0.0145 dioptersE) A) and D)
F) B) and C)

Question 14

An object is placed 60 cm from a convex lens with a focal length of magnitude 10 cm.What is the magnification?

Accepted Answer

A)  -0.10
B)  0.10
C)  0.15
D)  0.20
E)  -0.20F) B) and D)
G) B) and C)

Question 15

The near point of a farsighted person is 65 cm.What power contact lens must he use to correct this problem and be able to read a book at a normal near point of 25 cm?

Accepted Answer

A)  -4.2 diopters
B)  -2.5 diopters
C)  -2.4 diopters
D)  +4.2 diopters
E)  +2.5 dioptersF) C) and D)
G) B) and E)

Question 16

The focal lengths of the objective lens and the eyepiece of a microscope are 0.50 cm and 2.0 cm,respectively,and their separation adjusted for minimum eyestrain is 6.0 cm.If the microscope is focused on a small object,what is the distance between the object and the objective lens?

Accepted Answer

A)  0.31 cm
B)  0.42 cm
C)  0.49 cm
D)  0.57 cm
E)  0.73 cmF) A) and B)
G) C) and D)

Question 17

A lighted candle is placed a short distance from a plane mirror,as shown in the figure.At which location will the image of the flame appear to be located?

Accepted Answer

A)  at A
B)  at B
C)  at C
D)  at M (at the mirror) E) All of the above
F) None of the above

Question 18

For relaxed viewing with a microscope or a telescope,the eyepiece is adjusted to place the image at

Accepted Answer

A)  the near point of the eye.
B)  the pupil of the eye.
C)  the focal point of the eyepiece.
D)  infinity.
E)  the focal point of the objective lens.F) C) and E)
G) C) and D)

Question 19

You have available lenses of focal lengths 2.0 cm,4.0 cm,8.0 cm,and 16 cm.If you could use any two of these lenses to build a telescope,what is the lens separation for the telescope to provide the maximum magnification for comfortable viewing of a planet?

Accepted Answer

A)  10.0 cm
B)  12.0 cm
C)  18.0 cm
D)  24.0 cmE) B) and D)
F) A) and D)

Question 20

The objective lens and the eyepiece of a microscope have focal lengths of 4.0 mm and 25 mm,respectively.The objective produces a real image 30 times the size of the object,with the final image viewed at infinity.The near point of the microscope user is at 25 cm.What is the magnitude of the overall magnification of the microscope?

Accepted Answer

A)  250
B)  300
C)  350
D)  400
E)  450F) A) and B)
G) B) and D)

Exam 23: Mirrors and Lenses

A refracting telescope has an eyepiece of focal length -80 mm and an objective of focal length 36 cm.What is the magnification of this instrument?

Correct Answer
verified

Cal is viewing the Moon with his new telescope,using a 10-mm focal length eyepiece.For greater detail,he wishes to double the magnification of his telescope.An eyepiece having which one of the following characteristics will accomplish this for him?

Correct Answer
verified

The focal lengths of the objective lens and the eyepiece of a microscope are 0.50 cm and 2.0 cm,respectively,and their separation adjusted for minimum eyestrain is 6.0 cm.If the microscope is focused on a small object,what is the distance between the object and the objective lens?

Correct Answer
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A person cannot see clearly objects more than 70.0 cm away.What power of corrective lens should be prescribed if the glass is to be worn 1.00 cm in front of the eye?

Correct Answer
verified

An object is placed 60 cm from a convex lens with a focal length of magnitude 10 cm.What is the magnification?

Correct Answer
verified

A stature that is 3.0 cm tall statue is 24 cm in front of a concave mirror.The magnitude of the radius of curvature of the mirror is 20 cm. (a)Is the image real or virtual? (b)How far is the image from the mirror? (c)Is the image upright or inverted? (d)How tall is the image?

Correct Answer
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(a)real
(...
View Answer

The near point of a farsighted person is 65 cm.What power contact lens must he use to correct this problem and be able to read a book at a normal near point of 25 cm?

Correct Answer
verified

The length of a telescope is 1.60 m and it has a magnification of 60.0.What is the focal length of the eyepiece?

Correct Answer
verified

A farsighted boy has a near point at 2.3 m and requires contact lenses to correct his vision to the normal near point.What is the correct choice of lens power for the contact lenses?

Correct Answer
verified

You have available lenses of focal lengths 2.0 cm,4.0 cm,8.0 cm,and 16 cm.If you could use any two of these lenses to build a telescope,what is the lens separation for the telescope to provide the maximum magnification for comfortable viewing of a planet?

Correct Answer
verified

Correct Answer
verified

A lighted candle is placed a short distance from a plane mirror,as shown in the figure.At which location will the image of the flame appear to be located?

Correct Answer
verified

The focal length of the objective lens of a telescope is 75.0 cm,and the eyepiece has a focal length of 6.00 cm.What is the magnification of this telescope?

Correct Answer
verified

You are given two converging lenses to build a compound microscope.Lens A has focal length 0.50 cm and lens B has focal length of 3.0 cm.Which one of the two lenses would you use for the objective?

Correct Answer
verified

A nearsighted person wears contact lenses having a power of -0.15 diopters.What is the person's uncorrected far point?

Correct Answer
verified

For relaxed viewing with a microscope or a telescope,the eyepiece is adjusted to place the image at

Correct Answer
verified

Correct Answer
verified

What power contact lens should be used to correct the vision of a farsighted person whose near point is 80 cm so she can see things clearly that are 25 cm in front of her?

Correct Answer
verified

Which one of the following is a characteristic of a compound microscope?

Correct Answer
verified

You have a choice between two lenses of focal lengths f_a and f_b,where f_b = 2f_a,to use as the objective lens in building a compound microscope.If the magnification you obtain using lens a is M_a,what will be the magnification when using lens b?

Correct Answer
verified

Exam 23: Mirrors and Lenses

A refracting telescope has an eyepiece of focal length -80 mm and an objective of focal length 36 cm.What is the magnification of this instrument?

Correct AnswerverifiedShow Answer

Cal is viewing the Moon with his new telescope,using a 10-mm focal length eyepiece.For greater detail,he wishes to double the magnification of his telescope.An eyepiece having which one of the following characteristics will accomplish this for him?

Correct AnswerverifiedShow Answer

The focal lengths of the objective lens and the eyepiece of a microscope are 0.50 cm and 2.0 cm,respectively,and their separation adjusted for minimum eyestrain is 6.0 cm.If the microscope is focused on a small object,what is the distance between the object and the objective lens?

Correct AnswerverifiedShow Answer

A person cannot see clearly objects more than 70.0 cm away.What power of corrective lens should be prescribed if the glass is to be worn 1.00 cm in front of the eye?

Correct AnswerverifiedShow Answer

An object is placed 60 cm from a convex lens with a focal length of magnitude 10 cm.What is the magnification?

Correct AnswerverifiedShow Answer

A stature that is 3.0 cm tall statue is 24 cm in front of a concave mirror.The magnitude of the radius of curvature of the mirror is 20 cm. (a)Is the image real or virtual? (b)How far is the image from the mirror? (c)Is the image upright or inverted? (d)How tall is the image?

Correct Answerverified(a)real (...View AnswerShow Answer

The near point of a farsighted person is 65 cm.What power contact lens must he use to correct this problem and be able to read a book at a normal near point of 25 cm?

Correct AnswerverifiedShow Answer

The length of a telescope is 1.60 m and it has a magnification of 60.0.What is the focal length of the eyepiece?

Correct AnswerverifiedShow Answer

A farsighted boy has a near point at 2.3 m and requires contact lenses to correct his vision to the normal near point.What is the correct choice of lens power for the contact lenses?

Correct AnswerverifiedShow Answer

You have available lenses of focal lengths 2.0 cm,4.0 cm,8.0 cm,and 16 cm.If you could use any two of these lenses to build a telescope,what is the lens separation for the telescope to provide the maximum magnification for comfortable viewing of a planet?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A lighted candle is placed a short distance from a plane mirror,as shown in the figure.At which location will the image of the flame appear to be located?

Correct AnswerverifiedShow Answer

The focal length of the objective lens of a telescope is 75.0 cm,and the eyepiece has a focal length of 6.00 cm.What is the magnification of this telescope?

Correct AnswerverifiedShow Answer

You are given two converging lenses to build a compound microscope.Lens A has focal length 0.50 cm and lens B has focal length of 3.0 cm.Which one of the two lenses would you use for the objective?

Correct AnswerverifiedShow Answer

A nearsighted person wears contact lenses having a power of -0.15 diopters.What is the person's uncorrected far point?

Correct AnswerverifiedShow Answer

For relaxed viewing with a microscope or a telescope,the eyepiece is adjusted to place the image at

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What power contact lens should be used to correct the vision of a farsighted person whose near point is 80 cm so she can see things clearly that are 25 cm in front of her?

Correct AnswerverifiedShow Answer

Which one of the following is a characteristic of a compound microscope?

Correct AnswerverifiedShow Answer

You have a choice between two lenses of focal lengths fa and fb,where fb = 2fa,to use as the objective lens in building a compound microscope.If the magnification you obtain using lens a is Ma,what will be the magnification when using lens b?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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(a)real
(...
View 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
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Correct Answer
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Correct Answer
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Correct Answer
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You have a choice between two lenses of focal lengths f_a and f_b,where f_b = 2f_a,to use as the objective lens in building a compound microscope.If the magnification you obtain using lens a is M_a,what will be the magnification when using lens b?

Correct Answer
verified