Physics 2080 Chapter 23 Questions

Which best describes the image of a concave mirror when the object is located somewhere between the focal point and twice the focal-point distance from the mirror? a. virtual, upright, and magnification greater than one b. real, inverted, and magnification less than one c. virtual, upright, and magnification less than one d. real, inverted, and magnification greater than one

d. real, inverted, and magnification greater than one

The image of an object in a flat mirror is always: a. larger than the object b. smaller than the object c. independent of the size of the object d. the same size of the object

d. the same size of the object

A candle 15 cm high is placed in front of a concave mirror at the focal point. Describe the image that forms.

image forms at infinity

What is the focal length of a plane mirror? Why?

infinite, because it cannot focus light to a point

Translate into words the following mathematical relationships that are observed with flat mirror reflection: p=q and h=h^1

p=q: object distance = image distance h=h^1: object height = image height

What is the sign for object and image distances that are measured on the front side of the mirror?

positive

The law of reflection says that:

the angle of reflection from a mirror equals the angle of incidence

A line parallel to the principal axis is drawn from the object to a spherical mirror. How should the reflected ray be drawn?

through the focal point

A line is drawn from the object to a spherical mirror and passes through the center of curvature (C). How should the reflected ray be drawn?

upon itself (back through C)

If you hold a 900-cm^2 square plane mirror 45 cm from your eyes and can just see the full length of an 8.5-m flagpole behind you, how far are you from the pole?

12 m

What is the main difference between real and virtual images?

Real images can be displayed on a surface and virtual images cannot be displayed on a surface.

A shaving/makeup mirror is used to form an image that is larger than the object, so it is a a. concave b. convex c. plane mirror

a. concave

The shortest plane mirror in which you can see your entire image: a. is half your height b. is twice your height c. is equal to your height d. cannot be determined e. depends on how far the mirror is from you

a. is half your height

When a straight line is drawn perpendicular to a flat mirror at the point where an incoming ray strikes the mirror's surface, the angles of incidence and reflection are measured from the normal and: a. the angles of incidence and reflection are equal b. the angle of incidence is greater than the angle of reflection c. the angle of incidence is less than the angle of reflection d. the angle of incidence can be greater than or less than the angle of reflection

a. the angle of incidence and reflection are equal

The image produced by a convex mirror is always: a. virtual and upright b. real and upright c. virtual and inverted d. real and inverted

a. virtual and upright

A women 1.7 m tall stands 3.0 m in front of a plane mirror. a.) What is the minimum height the mirror must be to allow the woman to view her complete image from head to foot? Assume her eyes are 10 cm below the top of her head. b.) What would be the minimum required height of the mirror if she were to stand 5.0 m away?

a.) 0.85 m b.) 0.85 m

A small dog sits 1.5 m in front of a plane mirror. a.) Where is the dogs image in relation to the mirror? b.) If the dog jumps at the mirror at a speed of 0.50m/s, how fast does the dog approach its image?

a.) 1.5 m behind the mirror b.) 1.0 m/s

A person stands 2.0 m away from the reflecting surface of a plane mirror. a.) what is the distance between the person and his or her image? b.) what are the image characteristics?

a.) 4.0 m b.) upright, virtual, and same size

If a light ray strikes a flat mirror at an angle of 30 degrees from the normal, the ray will be reflected at an angle of: a. 30 degrees from the mirror's surface b. 60 degrees from the mirror's surface c. 60 degrees from the normal d. 90 degrees from the normal

b. 60 degrees from the mirror's surface

When the reflection of an object is seen in a convex mirror the image will: a. always be real b. always be virtual c. may be either real or virtual d. will always be enlarged

b. always be virtual

A plane mirror: a. produces both real and virtual images b. always produces a virtual image c. always produces a real image d. forms images by diffuse reflection

b. always produces a virtual image

Diffuse reflection occurs when the size of surface irregularities is: a. larger than 1 m in diameter b. large compared to the wavelength of the light used c. small compared to the wavelength of the light used d. larger than 1 cm in diameter e. none of the above

b. large compared to the wavelength of the light used

A plane mirror: a. has a greater image distance than the object distance b. produces a virtual, upright, unmagnified image c. changes the vertical orientation of an object d. reverses an object's top and bottom

b. produces a virtual, upright, unmagnified image

Which best describes the image of a concave mirror when the object is at a distance greater than twice the focal-point distance from the mirror? a. virtual, upright, and magnification greater than one b. real, inverted, and magnification less than one c. virtual, upright, and magnification less than one d. real, inverted, and magnification greater than one

b. real, inverted, and magnification less than one

If an object or image height is negative, where is the object or image located in relation to the principal axis?

below the principal axis

If you stand 3.0 m in front of a flat mirror, how far away from you would your image be in the mirror? a. 1.5 m b. 3.0 m c. 6.0 m d. 12.0 m

c. 6.0 m

What type of mirror is used whenever a magnified image of an object is needed? a. flat mirror b. concave mirror c. convex mirror d. two-way mirror

c. convex mirror

The lateral magnification of a plane mirror is: a. greater than one b. less than one c. equal to +1 d. equal to -1

c. equal to +1

When the reflection of an object is seen in a concave mirror the image will: a. always be real b. always be virtual c. may be either real or virtual d. will always be enlarged

c. may be either real or virtual

For a spherical mirror, the focal length is equal to __________ the radius of curvature of the mirror. a. one-fourth b. one-third c. one-half d. the square of

c. one-half

Which of the following describes the image of a convex mirror when the object's distance from the mirror is less than the absolute value of the focal point distance? a. virtual, upright and magnification greater than one b. real, inverted and magnification less than one c. virtual, upright and magnification less than one d. real, inverted and magnification greater than one

c. virtual, upright and magnification less than one

Which of the following best describes the image produced by a flat mirror? a. virtual, inverted, and magnification greater than one b. real, inverted, and magnification less than one c. virtual, upright, and magnification equal to one d. real, upright, and magnification equal to one

c. virtual, upright, and magnification equal to one

Which of the following statements concerning spherical mirrors is correct? a. a converging mirror alone can produce an inverted virtual image b. a diverging mirror alone can produce an inverted virtual image c. a diverging mirror can produce an inverted real image d. a converging mirror can produce an inverted real image

d. a converging mirror can produce an inverted real image

When a virtual image is created in a plane mirror: a. the image is upright b. the image is located behind the mirror c. reflected rays diverge d. all of the above e. none of the above

d. all of the above

Snow reflects almost all of the light incident upon it. However, a single beam of light is not reflected in the form of parallel rays. This is an example of ___________ reflection off a ___________ surface. a. regular, rough b. regular, specular c. diffuse, specular d. diffuse, rough

d. diffuse, rough