Question 1

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

Accepted Answer

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

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 
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 D

Question 3

A ball is held 50 cm in front of a plane mirror. The distance between the ball and its image is:

Accepted Answer

A)  0 cm 
B)  50 cm 
C)  100 cm 
D)  150 cm 
E)  200 cm 
A)  0 cm 
B)  50 cm 
C)  100 cm 
D)  150 cm 
E)  200 cm C

Question 4

A magnifying glass has a focal length of 15 cm. If the near point of the eye is 25 cm from the eye the angular magnification of the glass is about:

Accepted Answer

A)  0.067 
B)  0.33 
C)  0.5 
D)  0.67 
E)  1.7 
A)  0.067 
B)  0.33 
C)  0.5 
D)  0.67 
E)  1.7

Question 5

When a single-lens camera is focused on a distant object, the lens-to-film distance is found to be 40.0 mm. To focus on an object 0.540 m in front of the lens, the film-to-lens distance should be:

Accepted Answer

A)  36.8 mm 
B)  37.3 mm 
C)  40.0 mm 
D)  42.7 mm 
E)  43.2 mm 
A)  36.8 mm 
B)  37.3 mm 
C)  40.0 mm 
D)  42.7 mm 
E)  43.2 mm

Question 6

The two lenses shown are illuminated by a beam of parallel light from the left. Lens B is then moved slowly toward lens A. The beam emerging from lens B is:

Accepted Answer

A)  initially parallel and then diverging 
B)  always diverging 
C)  initially converging and finally parallel 
D)  always parallel 
E)  initially converging and finally diverging 
A)  initially parallel and then diverging 
B)  always diverging 
C)  initially converging and finally parallel 
D)  always parallel 
E)  initially converging and finally diverging

Question 7

Let p denote the object-lens distance and i the image-lens distance. The image produced by a lens of focal length f has a height that can be obtained from the object height by multiplying it by:

Accepted Answer

A)  p/i 
B)  i/p 
C)  f/p 
D)  f/i 
E)  i/f 
A)  p/i 
B)  i/p 
C)  f/p 
D)  f/i 
E)  i/f

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

Question 9

An object O, in air, is in front of the concave spherical refracting surface of a piece of glass. Which of the general situations depicted below is like this situation?

Accepted Answer

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

Question 10

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 
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 11

The image of an erect candle, formed using a convex mirror, is always:

Accepted Answer

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

Question 12

In a compound microscope, the objective has a focal length of 1.0 cm, the eyepiece has a focal length of 2.0 cm, and the tube length is 25 cm. What is the magnitude of the overall magnification of the microscope?

Accepted Answer

A)  25 
B)  50 
C)  100 
D)  250 
E)  310 
A)  25 
B)  50 
C)  100 
D)  250 
E)  310

Question 13

A concave spherical mirror has a focal length of 12 cm. If an erect object is placed 6 cm in front of it:

Accepted Answer

A)  the magnification is 2 and the image is erect 
B)  the magnification is 2 and the image is inverted 
C)  the magnification is 0.67 and the image is erect 
D)  the magnification is 0.67 and the image is inverted 
E)  the magnification is 0.5 and the image is erect 
A)  the magnification is 2 and the image is erect 
B)  the magnification is 2 and the image is inverted 
C)  the magnification is 0.67 and the image is erect 
D)  the magnification is 0.67 and the image is inverted 
E)  the magnification is 0.5 and the image is erect

Question 14

An object is 30 cm in front of a converging lens of focal length 10 cm. The image is:

Accepted Answer

A)  real and larger than the object 
B)  real and the same size than the object 
C)  real and smaller than the object 
D)  virtual and the same size than the object 
E)  virtual and smaller than the object 
A)  real and larger than the object 
B)  real and the same size than the object 
C)  real and smaller than the object 
D)  virtual and the same size than the object 
E)  virtual and smaller than the object

Question 15

A concave mirror forms a real image which is twice the size of the object. If the object is 20 cm from the mirror, the radius of curvature of the mirror must be about:

Accepted Answer

A)  13 cm 
B)  20 cm 
C)  27 cm 
D)  40 cm 
E)  80 cm 
A)  13 cm 
B)  20 cm 
C)  27 cm 
D)  40 cm 
E)  80 cm

Question 16

As an object is moved from a distant location toward the center of curvature of a concave mirror its image:

Accepted Answer

A)  remains virtual and becomes smaller 
B)  remains virtual and becomes larger 
C)  remains real and becomes smaller 
D)  remains real and becomes larger 
E)  changes from real to virtual 
A)  remains virtual and becomes smaller 
B)  remains virtual and becomes larger 
C)  remains real and becomes smaller 
D)  remains real and becomes larger 
E)  changes from real to virtual

Question 17

A concave spherical mirror has a focal length of 12 cm. If an object is placed 18 cm in front of it the image position is:

Accepted Answer

A)  7.2 cm behind the mirror 
B)  7.2 cm in front of the mirror 
C)  36 cm behind the mirror 
D)  36 cm in front of the mirror 
E)  at infinity 
A)  7.2 cm behind the mirror 
B)  7.2 cm in front of the mirror 
C)  36 cm behind the mirror 
D)  36 cm in front of the mirror 
E)  at infinity

Question 18

The bellows of an adjustable camera can be extended so that the largest film to lens distance is one and one-half times the focal length. If the focal length is 12 cm, the nearest object which can be sharply focused on the film must be what distance from the lens?

Accepted Answer

A)  12 cm 
B)  24 cm 
C)  36 cm 
D)  48 cm 
E)  72 cm 
A)  12 cm 
B)  24 cm 
C)  36 cm 
D)  48 cm 
E)  72 cm

Question 19

A convex refracting surface has a radius of 12 cm. Light is incident in air (n = 1) and refracted into a medium with an index of refraction of 2. Light incident parallel to the central axis is focused at a point:

Accepted Answer

A)  3 cm from the surface 
B)  6 cm from the surface 
C)  12 cm from the surface 
D)  18 cm from the surface 
E)  24 cm from the surface 
A)  3 cm from the surface 
B)  6 cm from the surface 
C)  12 cm from the surface 
D)  18 cm from the surface 
E)  24 cm from the surface

Question 20

An object is 2 m in front of a plane mirror. Its image is:

Accepted Answer

A)  virtual, inverted, and 2 m behind the mirror 
B)  virtual, inverted, and 2 m in front of the mirror 
C)  virtual, erect, and 2 m in front of the mirror 
D)  real, erect, and 2 m behind the mirror 
E)  none of the above 
A)  virtual, inverted, and 2 m behind the mirror 
B)  virtual, inverted, and 2 m in front of the mirror 
C)  virtual, erect, and 2 m in front of the mirror 
D)  real, erect, and 2 m behind the mirror 
E)  none of the above

Exam 34: Images

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

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

A ball is held 50 cm in front of a plane mirror. The distance between the ball and its image is:

A magnifying glass has a focal length of 15 cm. If the near point of the eye is 25 cm from the eye the angular magnification of the glass is about:

When a single-lens camera is focused on a distant object, the lens-to-film distance is found to be 40.0 mm. To focus on an object 0.540 m in front of the lens, the film-to-lens distance should be:

The two lenses shown are illuminated by a beam of parallel light from the left. Lens B is then moved slowly toward lens A. The beam emerging from lens B is:

Let p denote the object-lens distance and i the image-lens distance. The image produced by a lens of focal length f has a height that can be obtained from the object height by multiplying it by:

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

An object O, in air, is in front of the concave spherical refracting surface of a piece of glass. Which of the general situations depicted below is like this situation?

Which of the following is true of all virtual images?

The image of an erect candle, formed using a convex mirror, is always:

In a compound microscope, the objective has a focal length of 1.0 cm, the eyepiece has a focal length of 2.0 cm, and the tube length is 25 cm. What is the magnitude of the overall magnification of the microscope?

A concave spherical mirror has a focal length of 12 cm. If an erect object is placed 6 cm in front of it:

An object is 30 cm in front of a converging lens of focal length 10 cm. The image is:

A concave mirror forms a real image which is twice the size of the object. If the object is 20 cm from the mirror, the radius of curvature of the mirror must be about:

As an object is moved from a distant location toward the center of curvature of a concave mirror its image:

A concave spherical mirror has a focal length of 12 cm. If an object is placed 18 cm in front of it the image position is:

The bellows of an adjustable camera can be extended so that the largest film to lens distance is one and one-half times the focal length. If the focal length is 12 cm, the nearest object which can be sharply focused on the film must be what distance from the lens?

A convex refracting surface has a radius of 12 cm. Light is incident in air (n = 1) and refracted into a medium with an index of refraction of 2. Light incident parallel to the central axis is focused at a point:

An object is 2 m in front of a plane mirror. Its image is:

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