Question 1

An object 5.0 cm tall is placed 15 cm in front of a converging lens of focal length
30 cm. The final image size is

Accepted Answer

A)  2.5 cm 
B)  3.3 cm 
C)  5.0 cm 
D)  7.5 cm 
E)  10 cm 
A)  2.5 cm 
B)  3.3 cm 
C)  5.0 cm 
D)  7.5 cm 
E)  10 cm

Question 2

The clear water of a lake is 1.5 m deep at the end of a dock. You look directly down from the end of the dock and see a rock on the bottom of the lake. How far below the surface does the rock appear to be? (For water, n = 1.33.)

Accepted Answer

A)  2.0 m 
B)  1.5 m 
C)  1.1 m 
D)  0.75 m 
E)  1.8 m 
A)  2.0 m 
B)  1.5 m 
C)  1.1 m 
D)  0.75 m 
E)  1.8 m

Question 3

To locate the position of an image formed by a lens using ray tracing, one needs to

Accepted Answer

A)  have rays coming from multiple points of the object and find an intersect point. 
B)  have rays coming from one point of the object and find an intersect point. 
C)  have a ray going parallel to the axis. 
D)  have a ray pass through the edge of the lens without bending. 
E)  None of the above will give the location of the image. 
A)  have rays coming from multiple points of the object and find an intersect point. 
B)  have rays coming from one point of the object and find an intersect point. 
C)  have a ray going parallel to the axis. 
D)  have a ray pass through the edge of the lens without bending. 
E)  None of the above will give the location of the image.

Question 4

A thin converging lens made of Crown glass (n = 1.517) is flat on one side and has a radius of curvature of 50 cm on the other side. An object is placed 45.0 cm to the left of this lens. Where is the image?

Accepted Answer

A)  120 cm to the right of the lens 
B)  31 cm to the left of the lens 
C)  31 cm to the right of the lens 
D)  84 cm to the right of the lens 
E)  84 cm to the left of the lens 
A)  120 cm to the right of the lens 
B)  31 cm to the left of the lens 
C)  31 cm to the right of the lens 
D)  84 cm to the right of the lens 
E)  84 cm to the left of the lens

Question 5

A real object is 30 cm from a negative lens that has a focal length f = -20 cm. The image is

Accepted Answer

A)  virtual and 30 cm from the lens. 
B)  real and 12 cm from the lens. 
C)  virtual and 12 cm from the lens. 
D)  real and 20 cm from the lens. 
E)  None of these is correct. 
A)  virtual and 30 cm from the lens. 
B)  real and 12 cm from the lens. 
C)  virtual and 12 cm from the lens. 
D)  real and 20 cm from the lens. 
E)  None of these is correct.

Question 6

A real image is formed by a converging lens. If a weak diverging lens is placed between the converging lens and the image, where is the new image located?

Accepted Answer

A)  between the object and the converging lens 
B)  farther from the converging lens than the original image 
C)  closer to the converging lens than the original image 
D)  at the original image position 
E)  It might be either between the object and the converging lens or to the right of the diverging lens. 
A)  between the object and the converging lens 
B)  farther from the converging lens than the original image 
C)  closer to the converging lens than the original image 
D)  at the original image position 
E)  It might be either between the object and the converging lens or to the right of the diverging lens.

Question 7

The 200-in reflecting telescope at Mt. Palomar has an objective mirror with a focal length of 16.8 m. If you use an eyepiece with a focal length of 2.00 cm, what is the overall magnification of this telescope?

Accepted Answer

A)  -250 
B)  -130 
C)  -840 
D)  -38 
E)  -300 
A)  -250 
B)  -130 
C)  -840 
D)  -38 
E)  -300

Question 8

Your farsighted boyfriend requires lenses with a power of 1.85 diopters to read comfortably from a book that is 25.0 cm from his eyes. What is his near point without the lenses?

Accepted Answer

A)  54.1 cm 
B)  4.00 cm 
C)  46.5 cm 
D)  42.9 cm 
E)  36.2 cm 
A)  54.1 cm 
B)  4.00 cm 
C)  46.5 cm 
D)  42.9 cm 
E)  36.2 cm

Question 9

A point object P is placed before two mirrors at right angles as shown. Images of the object are formed only at positions

Accepted Answer

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

Question 10

A positive lens has a focal length f. The only way to get a magnification of -1 is to

Accepted Answer

A)  place a real object at the focal point. 
B)  place a real object at a distance 2f from the lens. 
C)  place a virtual object at a distance 2f from the lens. 
D)  Magnifications can never be negative. 
E)  None of these is correct. 
A)  place a real object at the focal point. 
B)  place a real object at a distance 2f from the lens. 
C)  place a virtual object at a distance 2f from the lens. 
D)  Magnifications can never be negative. 
E)  None of these is correct.

Question 11

An object is placed between 2f and infinity in front of a concave mirror of focal length f. The image is located

Accepted Answer

A)  behind the mirror, between 2f and the mirror. 
B)  behind the mirror, between 2f and infinity. 
C)  in front of the mirror, between the mirror and f. 
D)  in front of the mirror, between f and the center of curvature. 
E)  in front of the mirror, between the center of curvature and infinity. 
A)  behind the mirror, between 2f and the mirror. 
B)  behind the mirror, between 2f and infinity. 
C)  in front of the mirror, between the mirror and f. 
D)  in front of the mirror, between f and the center of curvature. 
E)  in front of the mirror, between the center of curvature and infinity.

Question 12

The technical name for the type of image formed by a single plane mirror is

Accepted Answer

A)  a real image. 
B)  an inverted image. 
C)  an enlarged image. 
D)  a focal image. 
E)  a virtual image. 
A)  a real image. 
B)  an inverted image. 
C)  an enlarged image. 
D)  a focal image. 
E)  a virtual image.

Question 13

Dentists often use concave mirrors to see better. In order for the mirror to produce an enlarged image of a tooth, the tooth must be placed

Accepted Answer

A)  at the focal point of the mirror. 
B)  further than the focal point of the mirror. 
C)  closer than the focal point of the mirror. 
D)  at any distance. 
E)  Concave mirrors cannot produce an enlarged image. 
A)  at the focal point of the mirror. 
B)  further than the focal point of the mirror. 
C)  closer than the focal point of the mirror. 
D)  at any distance. 
E)  Concave mirrors cannot produce an enlarged image.

Question 14

A real object is placed 9.00 cm from a converging lens that has a focal length of
24)0 cm. The image is

Accepted Answer

A)  0.119 cm from the lens, real, and smaller than the object. 
B)  0.119 cm from the lens, virtual, and smaller than the object. 
C)  14.4 cm from the lens, real, and enlarged. 
D)  14.4 cm from the lens, virtual, and enlarged. 
E)  11.7 cm from the lens, virtual, and enlarged. 
A)  0.119 cm from the lens, real, and smaller than the object. 
B)  0.119 cm from the lens, virtual, and smaller than the object. 
C)  14.4 cm from the lens, real, and enlarged. 
D)  14.4 cm from the lens, virtual, and enlarged. 
E)  11.7 cm from the lens, virtual, and enlarged.

Question 15

To project an image onto a screen using a lens,

Accepted Answer

A)  the lens must be diverging and the object must be farther from the lens than the second focal point. 
B)  the lens must be converging and the object must be between the first focal point and the lens. 
C)  the lens must be diverging and the image must be farther from the lens than the second focal point. 
D)  the lens must be converging and the object must be farther from the lens than the first focal point. 
E)  the lens must be diverging and the object must be between the first focal point and the lens. 
A)  the lens must be diverging and the object must be farther from the lens than the second focal point. 
B)  the lens must be converging and the object must be between the first focal point and the lens. 
C)  the lens must be diverging and the image must be farther from the lens than the second focal point. 
D)  the lens must be converging and the object must be farther from the lens than the first focal point. 
E)  the lens must be diverging and the object must be between the first focal point and the lens.

Question 16

A stamp collector with a normal near point (25 cm) needs a magnifying power of 10 to examine her stamps. What power of magnifying glass should she buy?

Accepted Answer

A)  0.40 diopters 
B)  2.5 diopters 
C)  10 diopters 
D)  40 diopters 
E)  25 diopters 
A)  0.40 diopters 
B)  2.5 diopters 
C)  10 diopters 
D)  40 diopters 
E)  25 diopters

Question 17

A negative lens with a focal length of -15 cm is 25 cm from a positive lens with a focal length of +20 cm on the same asix. Parallel light from the left is incident on the negative lens. The image formed by the positive lens is

Accepted Answer

A)  real and 40 cm from the positive lens. 
B)  virtual and 20 cm from the positive lens. 
C)  real and 20 cm from the positive lens. 
D)  real and 13 cm from the positive lens. 
E)  None of these is correct. 
A)  real and 40 cm from the positive lens. 
B)  virtual and 20 cm from the positive lens. 
C)  real and 20 cm from the positive lens. 
D)  real and 13 cm from the positive lens. 
E)  None of these is correct.

Question 18

A microscope has an objective lens of focal length 1.5 cm and an eyepiece of focal length 2.5 cm. Find the physical separation between the two lenses if the magnifying power is 200, assuming the near point of the viewer is 25 cm.

Accepted Answer

A)  30 cm 
B)  21 cm 
C)  34 cm 
D)  26 cm 
E)  29 cm 
A)  30 cm 
B)  21 cm 
C)  34 cm 
D)  26 cm 
E)  29 cm

Question 19

If the near point of your eye is 80.0 cm, what power of reading glasses should you use to bring your near point to 25.0 cm?

Accepted Answer

A)  -1.25 
B)  4.00 
C)  36.5 
D)  1.25 
E)  27.5 
A)  -1.25 
B)  4.00 
C)  36.5 
D)  1.25 
E)  27.5

Question 20

A 6-cm-high candle is placed in front of a converging lens with a focal length of magnitude 30 cm. If the image distance is +50 cm, then find the object distance to the lens.

Accepted Answer

A)  75 cm 
B)  50 cm 
C)  60 cm 
D)  80 cm 
E)  None of these is correct. 
A)  75 cm 
B)  50 cm 
C)  60 cm 
D)  80 cm 
E)  None of these is correct.

Exam 12: Optical Images

An object 5.0 cm tall is placed 15 cm in front of a converging lens of focal length 30 cm. The final image size is

The clear water of a lake is 1.5 m deep at the end of a dock. You look directly down from the end of the dock and see a rock on the bottom of the lake. How far below the surface does the rock appear to be? (For water, n = 1.33.)

To locate the position of an image formed by a lens using ray tracing, one needs to

A thin converging lens made of Crown glass (n = 1.517) is flat on one side and has a radius of curvature of 50 cm on the other side. An object is placed 45.0 cm to the left of this lens. Where is the image?

A real object is 30 cm from a negative lens that has a focal length f = -20 cm. The image is

A real image is formed by a converging lens. If a weak diverging lens is placed between the converging lens and the image, where is the new image located?

The 200-in reflecting telescope at Mt. Palomar has an objective mirror with a focal length of 16.8 m. If you use an eyepiece with a focal length of 2.00 cm, what is the overall magnification of this telescope?

Your farsighted boyfriend requires lenses with a power of 1.85 diopters to read comfortably from a book that is 25.0 cm from his eyes. What is his near point without the lenses?

A point object P is placed before two mirrors at right angles as shown. Images of the object are formed only at positions

A positive lens has a focal length f. The only way to get a magnification of -1 is to

An object is placed between 2f and infinity in front of a concave mirror of focal length f. The image is located

The technical name for the type of image formed by a single plane mirror is

Dentists often use concave mirrors to see better. In order for the mirror to produce an enlarged image of a tooth, the tooth must be placed

A real object is placed 9.00 cm from a converging lens that has a focal length of 24)0 cm. The image is

To project an image onto a screen using a lens,

A stamp collector with a normal near point (25 cm) needs a magnifying power of 10 to examine her stamps. What power of magnifying glass should she buy?

A negative lens with a focal length of -15 cm is 25 cm from a positive lens with a focal length of +20 cm on the same asix. Parallel light from the left is incident on the negative lens. The image formed by the positive lens is

A microscope has an objective lens of focal length 1.5 cm and an eyepiece of focal length 2.5 cm. Find the physical separation between the two lenses if the magnifying power is 200, assuming the near point of the viewer is 25 cm.

If the near point of your eye is 80.0 cm, what power of reading glasses should you use to bring your near point to 25.0 cm?

A 6-cm-high candle is placed in front of a converging lens with a focal length of magnitude 30 cm. If the image distance is +50 cm, then find the object distance to the lens.

The Electric Field I: Discrete Charge Distributions

The Electric Field II: Continuous Charge Distributions

Electric Potential

Capacitance

Electric Current and Direct-Current Circuits

The Magnetic Field

Sources of the Magnetic Field

Magnetic Induction

Alternating-Current Circuits

Maxwells Equations and Electromagnetic Waves

Properties of Light

Interference and Diffraction

Wave Particle Duality and Quantum Physics

Applications of the Schrodinger Equation

Atoms

Molecules

Solids and the Theory of Conduction

Relativity

Nuclear Physics

Elementary Particles and the Beginning of the Universe

Filters