Question 1

The Sun subtends 0.5 °\degree°  as seen from the Earth.Its image, using a 1.0-m focal length lens, is about:

Accepted Answer

A)  10 cm
B)  2 cm
C)  1 cm
D)  5 mm
E)  1 mm

Question 2

A point source is to be used with a concave mirror to produce a beam of parallel light.The source should be placed:

Accepted Answer

A)  as close to the mirror as possible
B)  at the center of curvature
C)  midway between the center of curvature and the focal point
D)  midway between the center of curvature and the mirror
E)  midway between the focal point and the mirror

Question 3

An ordinary magnifying glass in front of an erect object produces an image that is:

Accepted Answer

A)  real and erect
B)  real and inverted
C)  virtual and inverted
D)  virtual and erect
E)  none of these

Question 4

Two thin lenses (focal lengths f1 and f2) are in contact.Their equivalent focal length is:

Accepted Answer

A)  f1 + f2
B)  f1f2/(f1 + f2) 
C)  1/f1 + 1/f2
D)  f1 - f2
E)  f1(f1 - f2) /f2

Question 5

An erect object is 2f in front of a convex lens of focal length f.The image is:

Accepted Answer

A)  real, inverted, magnified
B)  real, erect, same size
C)  real, inverted, same size
D)  virtual, inverted, reduced
E)  real, inverted, reduced

Question 6

The object-lens distance for a certain converging lens is 400 mm.The image is three times the size of the object.To make the image five times the size of the object, the object-lens distance must be changed to:

Accepted Answer

A)  360 mm
B)  540 mm
C)  600 mm
D)  720 mm
E)  960 mm

Question 7

A convex spherical refracting surface separates a medium with index of refraction 2 from air.The image of an object outside the surface is real:

Accepted Answer

A)  always
B)  never
C)  only if it is close to the surface
D)  only if its distance from the surface is large compared to the radius of curvature
E)  only if the radius of curvature is small

Question 8

An erect object placed outside the focal point of a converging lens will produce an image that is:

Accepted Answer

A)  erect and virtual
B)  inverted and virtual
C)  erect and real
D)  inverted and real
E)  impossible to locate

Question 9

Which of the following five glass lenses is a diverging lens?

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  V

Question 10

A concave refracting surface of a medium with index of refraction n produces a real image no matter where an object is placed outside:

Accepted Answer

A)  always
B)  only if the index of refraction of the surrounding medium is less than n
C)  only if the index of refraction of the surrounding medium is greater than n
D)  never
E)  none of the above

Question 11

A man stands with his nose 8 cm from a concave shaving mirror of radius 32 cm.The distance from the mirror to the image of his nose is:

Accepted Answer

A)  8 cm
B)  12 cm
C)  16 cm
D)  24 cm
E)  32 cm

Question 12

A plano-convex glass (n = 1.5) lens has a curved side whose radius is 50 cm.If the image size is to be the same as the object size, the object should be placed at a distance from the lens of:

Accepted Answer

A)  50 cm
B)  100 cm
C)  200 cm
D)  340 cm
E)  400 cm

Question 13

Which of the following is true of all virtual images?

Accepted Answer

A)  They can be seen but not photographed
B)  They appear only briefly
C)  They are smaller than the objects
D)  They are larger than the objects
E)  None of the above

Question 14

If the image distance is negative,

Accepted Answer

A)  the image is real.
B)  the image is virtual.
C)  the lens is converging.
D)  the object distance must also be negative.
E)  this is not possible; the image distance must be positive.

Question 15

An erect object is in front of a convex mirror a distance greater than the focal length.The image is:

Accepted Answer

A)  real, inverted, and smaller than the object
B)  virtual, inverted, and larger than the object
C)  real, inverted, and larger than the object
D)  virtual, erect, and smaller than the object
E)  real, erect, and larger than the object

Question 16

If the image distance is negative,

Accepted Answer

A)  the image is real.
B)  the image is virtual.
C)  the mirror is concave.
D)  you have made a mistake; image distances must be positive.
E)  the object distance must also be negative.

Question 17

Two plane mirrors make an angle of 120 °\degree°  with each other.The maximum number of images of an object placed between them is:

Accepted Answer

A)  one
B)  two
C)  three
D)  four
E)  more than four

Question 18

Which type(s) of lenses can produce both real and virtual images?

Accepted Answer

A)  only diverging lenses
B)  only converging lenses
C)  only plane lenses
D)  both converging and diverging lenses
E)  neither converging nor diverging lenses

Exam 34: Images

An erect object is 2f in front of a convex lens of focal length f.The image is:

Correct Answer
verified

An erect object is in front of a convex mirror a distance greater than the focal length.The image is:

Correct Answer
verified

Two plane mirrors make an angle of 120 $\degree$ with each other.The maximum number of images of an object placed between them is:

Correct Answer
verified

The Sun subtends 0.5 $\degree$ as seen from the Earth.Its image, using a 1.0-m focal length lens, is about:

Correct Answer
verified

Which type(s) of lenses can produce both real and virtual images?

Correct Answer
verified

A point source is to be used with a concave mirror to produce a beam of parallel light.The source should be placed:

Correct Answer
verified

A convex spherical refracting surface separates a medium with index of refraction 2 from air.The image of an object outside the surface is real:

Correct Answer
verified

A man stands with his nose 8 cm from a concave shaving mirror of radius 32 cm.The distance from the mirror to the image of his nose is:

Correct Answer
verified

An ordinary magnifying glass in front of an erect object produces an image that is:

Correct Answer
verified

If the image distance is negative,

Correct Answer
verified

An erect object placed outside the focal point of a converging lens will produce an image that is:

Correct Answer
verified

A plano-convex glass (n = 1.5) lens has a curved side whose radius is 50 cm.If the image size is to be the same as the object size, the object should be placed at a distance from the lens of:

Correct Answer
verified

Which of the following five glass lenses is a diverging lens?

Correct Answer
verified

A concave refracting surface of a medium with index of refraction n produces a real image no matter where an object is placed outside:

Correct Answer
verified

The object-lens distance for a certain converging lens is 400 mm.The image is three times the size of the object.To make the image five times the size of the object, the object-lens distance must be changed to:

Correct Answer
verified

Two thin lenses (focal lengths f₁ and f₂) are in contact.Their equivalent focal length is:

Correct Answer
verified

Which of the following is true of all virtual images?

Correct Answer
verified

If the image distance is negative,

Correct Answer
verified

Exam 34: Images

An erect object is 2f in front of a convex lens of focal length f.The image is:

Correct AnswerverifiedShow Answer

An erect object is in front of a convex mirror a distance greater than the focal length.The image is:

Correct AnswerverifiedShow Answer

Two plane mirrors make an angle of 120 °\degree° with each other.The maximum number of images of an object placed between them is:

Correct AnswerverifiedShow Answer

The Sun subtends 0.5 °\degree° as seen from the Earth.Its image, using a 1.0-m focal length lens, is about:

Correct AnswerverifiedShow Answer

Which type(s) of lenses can produce both real and virtual images?

Correct AnswerverifiedShow Answer

A point source is to be used with a concave mirror to produce a beam of parallel light.The source should be placed:

Correct AnswerverifiedShow Answer

A convex spherical refracting surface separates a medium with index of refraction 2 from air.The image of an object outside the surface is real:

Correct AnswerverifiedShow Answer

A man stands with his nose 8 cm from a concave shaving mirror of radius 32 cm.The distance from the mirror to the image of his nose is:

Correct AnswerverifiedShow Answer

An ordinary magnifying glass in front of an erect object produces an image that is:

Correct AnswerverifiedShow Answer

If the image distance is negative,

Correct AnswerverifiedShow Answer

An erect object placed outside the focal point of a converging lens will produce an image that is:

Correct AnswerverifiedShow Answer

A plano-convex glass (n = 1.5) lens has a curved side whose radius is 50 cm.If the image size is to be the same as the object size, the object should be placed at a distance from the lens of:

Correct AnswerverifiedShow Answer

Which of the following five glass lenses is a diverging lens?

Correct AnswerverifiedShow Answer

A concave refracting surface of a medium with index of refraction n produces a real image no matter where an object is placed outside:

Correct AnswerverifiedShow Answer

The object-lens distance for a certain converging lens is 400 mm.The image is three times the size of the object.To make the image five times the size of the object, the object-lens distance must be changed to:

Correct AnswerverifiedShow Answer

Two thin lenses (focal lengths f1 and f2) are in contact.Their equivalent focal length is:

Correct AnswerverifiedShow Answer

Which of the following is true of all virtual images?

Correct AnswerverifiedShow Answer

If the image distance is negative,

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Two plane mirrors make an angle of 120 $\degree$ with each other.The maximum number of images of an object placed between them is:

Correct Answer
verified

The Sun subtends 0.5 $\degree$ as seen from the Earth.Its image, using a 1.0-m focal length lens, is about:

Correct Answer
verified

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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Two thin lenses (focal lengths f₁ and f₂) are in contact.Their equivalent focal length is:

Correct Answer
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Correct Answer
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Correct Answer
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