Question 1

A concave mirror is also known as a diverging mirror.

Accepted Answer

A) True 
 B)False

Question 2

A spherical mirror has a radius of curvature of 22 cm. If the mirror is concave, its focal length is

Accepted Answer

A) -11 cm. 
B) -22 cm. 
C) 11 cm. 
D) -44 cm. 
E) 22 cm. 
A) -11 cm. 
B) -22 cm. 
C) 11 cm. 
D) -44 cm. 
E) 22 cm.

Question 3

A light ray is reflected by two mirrors that are perpendicular. The new direction of the ray is

Accepted Answer

A) 180° from the original direction. 
B) 135° from the original direction. 
C) 45° from the original direction. 
D) between 90° and 180° from the original direction. 
E) 90° from the original direction. 
A) 180° from the original direction. 
B) 135° from the original direction. 
C) 45° from the original direction. 
D) between 90° and 180° from the original direction. 
E) 90° from the original direction.

Question 4

Light traveling at an angle into a denser medium is refracted

Accepted Answer

A) toward the normal. 
B) away from the normal. 
C) perpendicular to the normal. 
D) parallel to the normal. 
E) equally. 
A) toward the normal. 
B) away from the normal. 
C) perpendicular to the normal. 
D) parallel to the normal. 
E) equally.

Question 5

The image distance, di, is positive for images in front of a mirror.

Accepted Answer

A) True 
 B)False

Question 6

A single convex spherical mirror produces an image which is

Accepted Answer

A) always virtual. 
B) always imaginary. 
C) always real. 
D) real only if the object distance is less than f. 
E) real only if the object distance is greater than f. 
A) always virtual. 
B) always imaginary. 
C) always real. 
D) real only if the object distance is less than f. 
E) real only if the object distance is greater than f.

Question 7

An image formed when the light rays do not actually pass through the image location, and would not appear on paper or film placed at that location is referred to as a(n)

Accepted Answer

A) real image. 
B) virtual image. 
C) imaginary image. 
D) positive image. 
E) negative image. 
A) real image. 
B) virtual image. 
C) imaginary image. 
D) positive image. 
E) negative image.

Question 8

An optical fiber is 1.0 meter long and has a diameter of 20 μm. Its ends are perpendicular to its axis. Its index of refraction is 1.30. What is the maximum number of reflections a light ray entering one end will make before it emerges from the other end?

Accepted Answer

A) 84,000 
B) 42,000 
C) 26,000 
D) 24,000 
E) 18,000 
A) 84,000 
B) 42,000 
C) 26,000 
D) 24,000 
E) 18,000

Question 9

A light ray, traveling obliquely to a concave mirror's surface, crosses the axis at the mirror's focal point before striking the mirror's surface. After reflection, this ray

Accepted Answer

A) travels parallel to the mirror's axis. 
B) travels at right angles to the mirror's axis. 
C) passes through the mirror's center of curvature. 
D) passes through the mirror's focal point. 
E) passes through the axis midway between the mirror's focal point and center of curvature. 
A) travels parallel to the mirror's axis. 
B) travels at right angles to the mirror's axis. 
C) passes through the mirror's center of curvature. 
D) passes through the mirror's focal point. 
E) passes through the axis midway between the mirror's focal point and center of curvature.

Question 10

When light enters a material of higher index of refraction, its speed

Accepted Answer

A) decreases. 
B) first increases then decreases. 
C) stays the same. 
D) increases. 
E) first decreases then increases. 
A) decreases. 
B) first increases then decreases. 
C) stays the same. 
D) increases. 
E) first decreases then increases.

Question 11

Lucite has an index of refraction of 1.50. What is its critical angle of incidence?

Accepted Answer

A) 1.16° 
B) 15° 
C) 41.8° 
D) 65.2° 
E) 87.4° 
A) 1.16° 
B) 15° 
C) 41.8° 
D) 65.2° 
E) 87.4°

Question 12

A beam of light of two different wavelengths enters a pane of glass 3.00 mm thick at an angle of incidence of 56°. The indices of refraction for the two different colors are 1.514 and 1.528. Because of dispersion, the colored beams, although parallel, are separated by a small distance. How far apart are they?

Accepted Answer

A) 0.057 mm 
B) 0.0083 mm 
C) 0.025 mm 
D) 0.014 mm 
E) 0.0062 mm 
A) 0.057 mm 
B) 0.0083 mm 
C) 0.025 mm 
D) 0.014 mm 
E) 0.0062 mm

Question 13

A beam of light in water (n = 1.33) enters a glass slab (n = 1.50) at an angle of incidence of 60.0°. What is the angle of refraction?

Accepted Answer

A) 27.5° 
B) 39.8° 
C) 60.0° 
D) 90.0° 
E) 50.2° 
A) 27.5° 
B) 39.8° 
C) 60.0° 
D) 90.0° 
E) 50.2°

Question 14

A mirror with a focal length -25 cm has a 4.0 cm tall object placed 100 cm in front of it. What is the height of the image?

Accepted Answer

A) 0.8 cm 
B) 20 cm 
C) 4.0 cm 
D) -0.8 cm 
E) -20 cm 
A) 0.8 cm 
B) 20 cm 
C) 4.0 cm 
D) -0.8 cm 
E) -20 cm

Question 15

The explanation of the behavior of light based on the ray model is called "geometric optics."

Accepted Answer

A) True 
 B)False

Question 16

To find an image by ray tracing requires

Accepted Answer

A) four rays. 
B) two rays. 
C) eight rays. 
D) three rays. 
E) only one ray. 
A) four rays. 
B) two rays. 
C) eight rays. 
D) three rays. 
E) only one ray.

Question 17

An index of refraction less than one for a medium would imply

Accepted Answer

A) that the speed of light in the medium is the same as the speed of light in vacuum. 
B) that the speed of light in the medium is greater than the speed of light in vacuum. 
C) that the speed of light in the medium is less than the speed of light in vacuum. 
D) refraction is not possible. 
E) reflection is not possible. 
A) that the speed of light in the medium is the same as the speed of light in vacuum. 
B) that the speed of light in the medium is greater than the speed of light in vacuum. 
C) that the speed of light in the medium is less than the speed of light in vacuum. 
D) refraction is not possible. 
E) reflection is not possible.

Question 18

Is it possible to see a virtual image?

Accepted Answer

A) No, since the rays that seem to emanate from a virtual image do not in fact emanate from the image. 
B) No, since virtual images do not really exist. 
C) Yes, the rays that appear to emanate from a virtual image can be focused on the retina just like those from an illuminated object. 
D) Yes, since almost everything we see is virtual because most things do not themselves give off light, but only reflect light coming from some other source. 
E) Yes, but only indirectly in the sense that if the virtual image is formed on a sheet of photographic film, one could later look at the picture formed. 
A) No, since the rays that seem to emanate from a virtual image do not in fact emanate from the image. 
B) No, since virtual images do not really exist. 
C) Yes, the rays that appear to emanate from a virtual image can be focused on the retina just like those from an illuminated object. 
D) Yes, since almost everything we see is virtual because most things do not themselves give off light, but only reflect light coming from some other source. 
E) Yes, but only indirectly in the sense that if the virtual image is formed on a sheet of photographic film, one could later look at the picture formed.

Question 19

An object is placed at a concave mirror's center of curvature. The image produced by the mirror is located

Accepted Answer

A) out beyond the center of curvature. 
B) at the center of curvature. 
C) between the center of curvature and the focal point. 
D) at the focal point. 
E) between the focal point and the surface of the mirror. 
A) out beyond the center of curvature. 
B) at the center of curvature. 
C) between the center of curvature and the focal point. 
D) at the focal point. 
E) between the focal point and the surface of the mirror.

Question 20

A person's face is 30 cm in front of a concave shaving mirror. If the image is an erect image 1.5 times as large as the object, what is the mirror's focal length?

Accepted Answer

A) 20 cm 
B) 30 cm 
C) 50 cm 
D) 70 cm 
E) 90 cm 
A) 20 cm 
B) 30 cm 
C) 50 cm 
D) 70 cm 
E) 90 cm

Exam 32: Light: Reflection and Refraction

A concave mirror is also known as a diverging mirror.

A spherical mirror has a radius of curvature of 22 cm. If the mirror is concave, its focal length is

A light ray is reflected by two mirrors that are perpendicular. The new direction of the ray is

Light traveling at an angle into a denser medium is refracted

The image distance, di, is positive for images in front of a mirror.

A single convex spherical mirror produces an image which is

An image formed when the light rays do not actually pass through the image location, and would not appear on paper or film placed at that location is referred to as a(n)

An optical fiber is 1.0 meter long and has a diameter of 20 μm. Its ends are perpendicular to its axis. Its index of refraction is 1.30. What is the maximum number of reflections a light ray entering one end will make before it emerges from the other end?

A light ray, traveling obliquely to a concave mirror's surface, crosses the axis at the mirror's focal point before striking the mirror's surface. After reflection, this ray

When light enters a material of higher index of refraction, its speed

Lucite has an index of refraction of 1.50. What is its critical angle of incidence?

A beam of light in water (n = 1.33) enters a glass slab (n = 1.50) at an angle of incidence of 60.0°. What is the angle of refraction?

A mirror with a focal length -25 cm has a 4.0 cm tall object placed 100 cm in front of it. What is the height of the image?

The explanation of the behavior of light based on the ray model is called "geometric optics."

To find an image by ray tracing requires

An index of refraction less than one for a medium would imply

Is it possible to see a virtual image?

An object is placed at a concave mirror's center of curvature. The image produced by the mirror is located

A person's face is 30 cm in front of a concave shaving mirror. If the image is an erect image 1.5 times as large as the object, what is the mirror's focal length?

Introduction, Measurement, Estimating

Describing Motion: Kinematics in One Dimension

Kinematics in Two or Three Dimensions; Vectors

Dynamics: Newtons Laws of Motion

Using Newtons Laws: Friction, Circular Motion, Drag Forces

Gravitation and Newtons6 Synthesis

Work and Energy

Conservation of Energy

Linear Momentum

Rotational Motion

Angular Momentum; General Rotation

Static Equilibrium; Elasticity and Fracture

Fluids

Oscillations

Wave Motion

Sound

Temperature, Thermal Expansion, and the Ideal Gas Law

Kinetic Theory of Gases

Heat and the First Law of Thermodynamics

Second Law of Thermodynamics

Electric Charge and Electric Field

Gausss Law

Electric Potential

Capacitance, Dielectrics, Electric Energy Storage

Electric Currents and Resistance

Dc Circuits

Magnetism

Sources of Magnetic Field

Electromagnetic Induction and Faradays Law

Inductance, Electromagnetic Oscillations, and Ac Circuits

Maxwells Equations and Electromagnetic Waves

Lenses and Optical Instruments

The Wave Nature of Light; Interference

Diffraction and Polarization

Special Theory of Relativity

Early Quantum Theory and Models of the Atom

Quantum Mechanics

Quantum Mechanics of Atoms

Molecules and Solids

Nuclear Physics and Radioactivity

Nuclear Energy: Efects and Uses of Radiation

Elementary Particle

Astrophysics and Cosmology

Filters

The image distance, d_i, is positive for images in front of a mirror.