24 terms

# physics classroom: reflection and mirrors

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Which of the following best describes the image formed by a plane mirror?
A. virtual, inverted and enlarged
B. real, inverted and reduced
C. virtual, upright and the same size as object
D. real, upright and the same size as object
C
Which of the following best describes the image formed by a concave mirror when the object is located somewhere between the focal point (F) and the center of curvature (C) of the mirror?

a. virtual, upright and enlarged
b. real, inverted and reduced
c. virtual, upright and reduced
d. real, inverted and enlarged
D
Which of the following best describes the image formed by a concave mirror when the object is at a distance further than the center of curvature (C) of the mirror?

a. virtual, erect and enlarged
b. real, inverted and reduced
c. virtual, upright and reduced
d. real, inverted and enlarged
B
Which of the following best describes the image formed by a concave mirror when the object distance from the mirror is less than the focal length (f)?

a. virtual, upright and enlarged
b. real, inverted and reduced
c. virtual, upright and reduced
A
Which of the following best describes the image formed by a convex mirror when the object distance from the mirror is less than the absolute value of the focal length (f)?

a. virtual, upright and enlarged
b. real, inverted and reduced
c. virtual, upright and reduced
d. real, inverted and enlarged
C
Use of a parabolic mirror, instead of one made of a circular arc surface, can be used to reduce the occurrence of which of the following effects?

a. spherical aberration
b. mirages
c. chromatic aberration
d. light scattering
A
When the image of an object is seen in a plane mirror, the image is _____.

a. real and upright.
b. real and inverted.
c. virtual and upright.
d. virtual and inverted.
C
When the image of an object is seen in a plane mirror, the distance from the mirror to the image depends on _____.

A. the wavelength of light used for viewing.
B. the distance from the object to the mirror.
C. the distance of both the observer and the object to the mirror.
B
If a man wishes to use a plane mirror on a wall to view both his head and his feet as he stands in front of the mirror, the required length of the mirror _____.

A. is equal to the height of the man.
B. is equal to one half the height of the man.
C. depends on the distance the man stands from the mirror.
D. depends on both the height of the man and the distance from the man to the mirror.
B
When the image of an object is seen in a concave mirror the image will _____.

a. always be real.
b. always be virtual.
c. be either real or virtual.
d. will always be magnified.
C.
When the image 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 magnified.
B
Rays of light traveling parallel to the principal axis of a concave mirror will come together _____.

a. at the center of curvature.
b. at the focal point.
c. at infinity.
d. at a point half way to the focal point.
B
Right angle mirrors produce three images of objects. Which of the following is statements is/are true of the middle image?

A. The middle image is the same size as the object.
B. The middle image is the same distance from the mirror as the object.
C. The middle image will exhibit left-right reversal relative to the object.
D.The middle image is a real image.
E. The middle image is an upright image.
F. The magnification of the middle image is -1.
G. When sighting at the middle image, light will reflect twice prior to reaching one's eye.
A
B
E
G
Two plane mirrors are attached to form a dual mirror system with an adjustable angle. As the angle between the mirrors increases, the number of images _____.

a. increase
b. decreases
c. remains the same
B
Which of the following statements is/are true of a virtual image?

A. Virtual images are always located behind the mirror.
B. Virtual images can be either upright or inverted.
C. Virtual images can be magnified in size, reduced in size or the same size as the object.
D. Virtual images can be formed by concave, convex and plane mirrors.
E. Virtual images are not real; thus you could never see them when sighting in a mirror.
F. Virtual images result when the reflected light rays diverge.
G. Virtual images can be projected onto a sheet of paper.
A
c
d
f
Which of the following statements is/are true of a real image?

A. Real images are always located behind the mirror.
B. Real images can be either upright or inverted.
C. Real images can be magnified in size, reduced in size or the same size as the object.
D. Real images can be formed by concave, convex and plane mirrors.
E. Real images are not virtual; thus you could never see them when sighting in a mirror.
F. Real images result when the reflected light rays diverge.
G. Real images can be projected onto a sheet of paper.
C
G
specular reflection
light reflects off a smooth surface
diffuse reflection
light reflects off a rough surface
Focal lengths, object and image distances are ________ if they are on the reflective side of the mirror. Object and image heights are positive if they are ________ the principle axis.
positive
below
The best definition of refraction is ____.

a. passing through a boundary
b. bouncing off a boundary
c. changing speed at a boundary
d. changing direction when crossing a boundary
D
Which of the following describes what will happen to a light ray incident on an air-to-glass boundary?

a. total reflection
b. total transmission
c. partial reflection, partial transmission
d. partial reflection, total transmission
C
Which of the following describes what will happen to a light ray incident on an air-to-glass boundary at an angle of incidence less than the critical angle?

a. total reflection
b. total transmission
c. partial reflection, partial transmission
d. partial reflection, total transmission
C
If total internal reflection occurs at a glass-air surface, then _____.

A. no light is refracted
B. no light is reflected
C.light is leaving the air and hitting the glass with an incident angle greater than the critical angle
D. light is leaving the air and hitting the glass with an incident angle less than the critical angle
A
When light from air hits a smooth piece of glass with the ray perpendicular to the glass surface, the part of the light passing into the glass _____.

a. will not change its speed
b. will not change its direction
c. will not change its wavelength
d. will not change its intensity
B