Question 1

When light crosses the boundary between media, the characteristic of the light that remains unchanged is

Accepted Answer

A)  frequency. 
B)  speed. 
C)  wavelength. 
D)  None of the above. 
A)  frequency. 
B)  speed. 
C)  wavelength. 
D)  None of the above.

Question 2

A spherical air bubble is embedded in a glass slab. An incident ray of light approaches the bubble as shown in the figure. After passing through the air bubble, the ray of light follows the path labeled.

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
E)  E 
A)  A 
B)  B 
C)  C 
D)  D 
E)  E

Question 3

To construct an astronomical telescope, the separation between the two converging lenses of focal lengths 100 cm and 10 cm should be

Accepted Answer

A)  10 cm. 
B)  90 cm. 
C)  100 cm. 
D)  110 cm. 
A)  10 cm. 
B)  90 cm. 
C)  100 cm. 
D)  110 cm.

Question 4

A thin converging lens is used to form a real image of an object placed between the focal point and the lens. The object is moved closer to the lens. The new image

Accepted Answer

A)  is closer to the lens and larger. 
B)  is closer to the lens and smaller. 
C)  is farther away from the lens and smaller. 
D)  is farther away from the lens and larger. 
A)  is closer to the lens and larger. 
B)  is closer to the lens and smaller. 
C)  is farther away from the lens and smaller. 
D)  is farther away from the lens and larger.

Question 5

A small object is placed 12 cm in front of a converging lens with a focal length of 3.0 cm. The image will be

Accepted Answer

A)  real and inverted. 
B)  real and upright. 
C)  virtual and inverted. 
D)  virtual and upright. 
A)  real and inverted. 
B)  real and upright. 
C)  virtual and inverted. 
D)  virtual and upright.

Question 6

Ordinarily, light microscopes using magnifications greater than about 2000 are not built because the light received would be too

Accepted Answer

A)  dim. 
B)  bright. 
C)  much refracted. 
D)  strongly diffracted. 
A)  dim. 
B)  bright. 
C)  much refracted. 
D)  strongly diffracted.

Question 7

Two plane mirrors make an angle of 58o. A light ray enters the system and is reflected once off each mirror. The ray is turned to

Accepted Answer

A)  60o. 
B)  120o. 
C)  150o. 
D)  180o. 
E)  210o. 
A)  60o. 
B)  120o. 
C)  150o. 
D)  180o. 
E)  210o.

Question 8

When you approach a vertical plane mirror at a speed of 1.0 m/s, you approach your image at a speed of

Accepted Answer

A)  2.0 m/s. 
B)  1.0 m/s. 
C)  0.50 m/s. 
D)  0.25 m/s. 
E)  More information is needed to work out the answer. 
A)  2.0 m/s. 
B)  1.0 m/s. 
C)  0.50 m/s. 
D)  0.25 m/s. 
E)  More information is needed to work out the answer.

Question 9

Spherical aberration is a description of the fact that a spherical mirror has a focal length (call it ff) for light striking it far from the central axis that differs from the focal length (call it fc) for light striking it close to the central axis. By taking the "limiting" case of a hemisphere it becomes clear that

Accepted Answer

A)  ff c for the outer rays not "far" from as well as for outer rays farther from the central axis. 
B)  ff c for the outer rays not "far" from the central axis, and ff > fc for outer rays farther from the central axis. 
C)  ff > fc for the outer rays not "far" from the central axis, and ff c for outer rays farther from the central axis. 
D)  ff > fc for the outer rays not "far" from as well as for outer rays farther from the central axis. 
A)  ff c for the outer rays not "far" from as well as for outer rays farther from the central axis. 
B)  ff c for the outer rays not "far" from the central axis, and ff > fc for outer rays farther from the central axis. 
C)  ff > fc for the outer rays not "far" from the central axis, and ff c for outer rays farther from the central axis. 
D)  ff > fc for the outer rays not "far" from as well as for outer rays farther from the central axis.

Question 10

The image of a flower on a 35-mm color slide is 2.0 mm high. It is to be projected onto a screen 5.0 m from the slide, and it is to appear 50.0 cm high. The distance between the lens and the slide is

Accepted Answer

A)  2.0 mm. 
B)  2.0 cm. 
C)  2.0 m. 
D)  1.3 cm. 
E)  1.3 m. 
A)  2.0 mm. 
B)  2.0 cm. 
C)  2.0 m. 
D)  1.3 cm. 
E)  1.3 m.

Question 11

Suppose the Earth's atmosphere can be modeled by a series of cells of air with flat interfaces and indexes of refraction increasing with depth below the "top" (upper) surface. A ray strikes the upper surface at some nonzero angle with respect to the surface normal. As it comes toward the Earth, the ray direction will

Accepted Answer

A)  continue to change such that its direction will deviate more and more (from its original direction) as it travels deeper into the atmosphere, but will never curve across the normal at the local surface. 
B)  continue to change such that its direction will deviate more and more (from its original direction) as it travels deeper into the atmosphere, even curving across the normal at the local surface if the initial conditions are right. 
C)  reverse its change compared to the original refraction it experiences on its initial encounter with the atmosphere, but will never curve back to cross a line parallel to the original direction at the top surface. 
D)  reverse its change compared to the original refraction it experiences on its initial encounter with the atmosphere, even curving back to cross a line parallel to the original direction at the top surface if the initial conditions are right. 
E)  More information is needed to work out the answer. 
A)  continue to change such that its direction will deviate more and more (from its original direction) as it travels deeper into the atmosphere, but will never curve across the normal at the local surface. 
B)  continue to change such that its direction will deviate more and more (from its original direction) as it travels deeper into the atmosphere, even curving across the normal at the local surface if the initial conditions are right. 
C)  reverse its change compared to the original refraction it experiences on its initial encounter with the atmosphere, but will never curve back to cross a line parallel to the original direction at the top surface. 
D)  reverse its change compared to the original refraction it experiences on its initial encounter with the atmosphere, even curving back to cross a line parallel to the original direction at the top surface if the initial conditions are right. 
E)  More information is needed to work out the answer.

Question 12

The principle on which fiber optics is based is

Accepted Answer

A)  reflection. 
B)  refraction. 
C)  dispersion. 
D)  total internal reflection. 
E)  polarization. 
A)  reflection. 
B)  refraction. 
C)  dispersion. 
D)  total internal reflection. 
E)  polarization.

Question 13

A concave mirror with a radius of 20 cm creates a real image 30 cm from the mirror. The object is placed

Accepted Answer

A)  7.5 cm in front of the mirror. 
B)  15 cm in front of the mirror. 
C)  30 cm in front of the mirror. 
D)  15 cm behind the mirror. 
E)  7.5 cm behind the mirror. 
A)  7.5 cm in front of the mirror. 
B)  15 cm in front of the mirror. 
C)  30 cm in front of the mirror. 
D)  15 cm behind the mirror. 
E)  7.5 cm behind the mirror.

Question 14

When an object is placed 10 cm in front of a convex mirror, its virtual image is placed 5.0 cm away from the mirror. When the same object is placed 5.0 cm in front of the same convex mirror, the image is placed

Accepted Answer

A)  2.5 cm in front of the mirror. 
B)  5.0 cm in front of the mirror. 
C)  10 cm in front of the mirror. 
D)  5.0 cm behind the mirror. 
E)  2.5 cm behind the mirror. 
A)  2.5 cm in front of the mirror. 
B)  5.0 cm in front of the mirror. 
C)  10 cm in front of the mirror. 
D)  5.0 cm behind the mirror. 
E)  2.5 cm behind the mirror.

Question 15

When light is dispersed by an ordinary glass prism, the color with its path deviated least from its original direction is

Accepted Answer

A)  blue. 
B)  green. 
C)  red. 
D)  All colors undergo the same deviation. 
E)  None of the colors undergo any deviation. 
A)  blue. 
B)  green. 
C)  red. 
D)  All colors undergo the same deviation. 
E)  None of the colors undergo any deviation.

Question 16

For a simple converging lens of ordinary glass, the focal length for red light is related to the focal length (call it fb) for blue light by the relation

Accepted Answer

A)  larger than the focal length for blue light. 
B)  equal to the focal length for blue light. 
C)  less than the focal length for blue light. 
D)  None of the previous answers is correct. 
A)  larger than the focal length for blue light. 
B)  equal to the focal length for blue light. 
C)  less than the focal length for blue light. 
D)  None of the previous answers is correct.

Question 17

A convex lens made of air (enclosed by a very thin rigid material) and used below the surface of the water will result in a

Accepted Answer

A)  converging lens. 
B)  diverging lens. 
C)  lens of infinite focal distance. 
A)  converging lens. 
B)  diverging lens. 
C)  lens of infinite focal distance.

Question 18

An oil layer that is 4.0 cm thick is spread smoothly and evenly over the surface of water on a windless day. The angle of refraction in the water for a ray of light that has an angle of incidence of 45o as it enters the oil from the air above is 32o. (The index of refraction for oil is 1.15, and for water it is 1.33.) If the layer of oil becomes thicker, the angle of refraction in the water

Accepted Answer

A)  increases. 
B)  stays the same. 
C)  decreases. 
D)  More information is needed to work out the answer. 
A)  increases. 
B)  stays the same. 
C)  decreases. 
D)  More information is needed to work out the answer.

Question 19

A hypermetropic eye cannot focus on objects that are more than 2.50 m away from it. The power of the lens used to correct this vision defect is

Accepted Answer

A)  +0.400 diopters. 
B)  +2.50 diopters. 
C)  -2.50 diopters. 
D)  -0.400 diopters. 
A)  +0.400 diopters. 
B)  +2.50 diopters. 
C)  -2.50 diopters. 
D)  -0.400 diopters.

Question 20

A certain converging lens has a focal length of 25 cm. To obtain a combination of power of 3.0 diopters, the lens should be combined with a second

Accepted Answer

A)  diverging lens of focal length 5.0 cm. 
B)  diverging lens of focal length 8.0 cm. 
C)  diverging lens of focal length 100 cm. 
D)  converging lens of focal length 100 cm. 
E)  converging lens of focal length 8.0 cm. 
A)  diverging lens of focal length 5.0 cm. 
B)  diverging lens of focal length 8.0 cm. 
C)  diverging lens of focal length 100 cm. 
D)  converging lens of focal length 100 cm. 
E)  converging lens of focal length 8.0 cm.

Exam 34: Reflection, Refraction, and Optics

When light crosses the boundary between media, the characteristic of the light that remains unchanged is

A spherical air bubble is embedded in a glass slab. An incident ray of light approaches the bubble as shown in the figure. After passing through the air bubble, the ray of light follows the path labeled.

To construct an astronomical telescope, the separation between the two converging lenses of focal lengths 100 cm and 10 cm should be

A thin converging lens is used to form a real image of an object placed between the focal point and the lens. The object is moved closer to the lens. The new image

A small object is placed 12 cm in front of a converging lens with a focal length of 3.0 cm. The image will be

Ordinarily, light microscopes using magnifications greater than about 2000 are not built because the light received would be too

Two plane mirrors make an angle of 58o. A light ray enters the system and is reflected once off each mirror. The ray is turned to

When you approach a vertical plane mirror at a speed of 1.0 m/s, you approach your image at a speed of

The image of a flower on a 35-mm color slide is 2.0 mm high. It is to be projected onto a screen 5.0 m from the slide, and it is to appear 50.0 cm high. The distance between the lens and the slide is

The principle on which fiber optics is based is

A concave mirror with a radius of 20 cm creates a real image 30 cm from the mirror. The object is placed

When an object is placed 10 cm in front of a convex mirror, its virtual image is placed 5.0 cm away from the mirror. When the same object is placed 5.0 cm in front of the same convex mirror, the image is placed

When light is dispersed by an ordinary glass prism, the color with its path deviated least from its original direction is

For a simple converging lens of ordinary glass, the focal length for red light is related to the focal length (call it fb) for blue light by the relation

A convex lens made of air (enclosed by a very thin rigid material) and used below the surface of the water will result in a

A hypermetropic eye cannot focus on objects that are more than 2.50 m away from it. The power of the lens used to correct this vision defect is

A certain converging lens has a focal length of 25 cm. To obtain a combination of power of 3.0 diopters, the lens should be combined with a second

Space, Time, and Mass

Motion Along a Straight Line

Vectors

Motion in Two and Three Dimensions

Newtons Laws of Motion

Further Applications of Newtons Laws

Work and Energy

Conservation of Energy

Gravitation

Systems of Particles

Collisions

Rotation of a Rigid Body

Dynamics of a Rigid Body

Statics and Elasticity

Oscillations

Waves

Sound

Fluid Mechanics

The Ideal Gas

Heat

Thermodynamics

Electric Force and the Electric Charge

The Electric Field

Gauss Law

Electrostatic Potential and Energy

Capacitors and Dielectrics

Currents and Ohms Law

Direct Current Circuits

Magnetic Force and Field

Charges and Currents in Magnetic Fields

Electromagnetic Induction

Alternating Current Circuits

Electromagnetic Waves

Interference and Diffraction

The Theory of Special Relativity

Quanta of Light

Spectral Lines, Bohrs Theory, and Quantum Mechanics

Quantum Structure of Atoms, Molecules, and Solids

Nuclei

Elementary Particles and Cosmology

Filters

Two plane mirrors make an angle of 58^o. A light ray enters the system and is reflected once off each mirror. The ray is turned to

For a simple converging lens of ordinary glass, the focal length for red light is related to the focal length (call it f_b) for blue light by the relation