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American System Physics

A Physics Toolkit

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Representing Motion

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Accelerated Motion

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Forces in One Dimension

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Displacement and Force in Two Dimensions

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Motion in Two Dimensions

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Gravitation

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Rotational Motion

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Momentum and Its Conservation

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Energy and Its Conservation

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Thermal Energy

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States of Matter

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Vibrations and Waves

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Sound

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Fundamentals of Light

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Reflection and Refraction

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Interference and Diffraction

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Electrostatics

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Electric Current and Circuits

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Magnetic Fields

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Electromagnetic Induction and Electromagnetism

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Quantum Theory and the Atom

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Solid-State Electronics

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Nuclear and Particle Physics

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Quiz

16.1 Reflection and Plane Mirrors – Quiz

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Reflection and Plane Mirrors American Physics quiz: free practice for American System Physics. Work through this Reflection and Plane Mirrors American Physics quiz and get instant feedback on every answer. If you get stuck, review the 16.1 Reflection and Plane Mirrors — Notes lesson. More practice: American System Physics — all units. Syllabus: OpenStax free science textbooks.

  • Questions count: 50
  • Passing grade: A-
  • Time limit:
Start Quiz
1.
Read the angle marked on the diagram. What is the angle of reflection for this ray?
Dr Dabour Hub Academy - figure 1
40°
80°
100°
50°
2.
The ray in this diagram arrives at a shallow angle to the mirror. What angle does the reflected ray make with the normal?
Dr Dabour Hub Academy - figure 2
75°
15°
30°
150°
3.
The diagram shows an object O in front of a plane mirror. Which point marks the position of its image?
Dr Dabour Hub Academy - figure 3
B
A
C
D
4.
The object O in the diagram is moved 2 cm further from the mirror. Where is the new image?
Dr Dabour Hub Academy - figure 4
At point B
At point D
2 cm behind the mirror at point A
At point C
5.
What does the gradient of the graph of r against i show?
Dr Dabour Hub Academy - figure 5
The gradient is 1, so r = i
The gradient is 2, so r = 2i
The gradient is 0, so r is constant
The gradient is −1, so r = 90° − i
6.
The diagram shows parallel rays reflecting from surfaces X and Y. Which statement is correct?
Dr Dabour Hub Academy - figure 6
Y is a mirror; X is paper
X gives specular reflection and could form an image; Y gives diffuse reflection
Neither surface obeys the law of reflection
Both give diffuse reflection
7.
In the periscope shown in the diagram, what is the angle of incidence of the light on mirror M1?
Dr Dabour Hub Academy - figure 7
90°
0°
45°
30°
8.
Which result in the table is anomalous?
i = 50°, r = 58°
i = 20°, r = 20°
i = 30°, r = 31°
i = 60°, r = 61°
9.
Apart from the anomaly, what do the results in the table show?
r is always larger than i
i = r within about ±1° experimental error
r = 2i
r = 90° − i
10.
Which entry completes the table for the size of a plane mirror image?
Larger than the object
Same size as the object
Smaller than the object
Depends on the distance
11.
Using the table, what is the distance between the walker and her image at t = 3 s?
1.6 m
0.8 m
6.4 m
3.2 m
12.
A ray strikes a plane mirror at 25° to the mirror surface. What is the angle of reflection?
65°
25°
155°
50°
13.
A torch beam grazes a bathroom mirror, making an angle of 62° with the glass. Find the angle between the reflected beam and the normal.
62°
28°
118°
124°
14.
The angle of incidence on a mirror is 35°. What is the angle between the incident ray and the reflected ray?
35°
110°
70°
55°
15.
A laser pointer beam hits a mirror with i = 50°. Find the angle formed at the mirror between the incoming beam and the outgoing beam.
50°
80°
40°
100°
16.
A mirror is rotated by 12° while the incident ray stays fixed. Through what angle does the reflected ray turn?
24°
12°
6°
48°
17.
A girl stands 1.5 m in front of a plane mirror. How far is she from her image?
1.5 m
3 m
0.75 m
6 m
18.
In a dance studio a teacher stands 2.4 m from the mirror wall. What is the distance between the teacher and his reflection?
2.4 m
1.2 m
4.8 m
9.6 m
19.
A man walks towards a plane mirror at 1.2 m/s. At what speed does he approach his image?
1.2 m/s
0.6 m/s
0 m/s
2.4 m/s
20.
A student is 1.70 m tall. What is the minimum length of a vertical plane mirror in which she can see her full height?
0.85 m
1.70 m
3.40 m
0.43 m
21.
Two plane mirrors are placed at 60° to each other with an object between them. How many images are formed?
6
5
4
12
22.
A kaleidoscope uses two mirrors hinged at 45°. How many images of a bead placed between them are formed?
8
6
7
16
23.
Some surfaces give clear reflections and some do not. Which surface is linked to its type of reflection?
Painted wall — diffuse
Mirror — diffuse
Still pond — diffuse
Paper — specular
24.
A labelled ray diagram uses several key words. Which key word is given its correct meaning?
Incident ray — ray leaving the surface
Normal — line at 90° to the surface at the point of incidence
Reflected ray — ray approaching the mirror
Virtual image — image caught on a screen
25.
A student lists properties of her image in a bathroom mirror. Which property is correctly stated?
Size — enlarged
Type — real
Orientation — upright
Distance — half the object distance
26.
Hinged mirrors produce multiple images. Which hinge angle is listed with the correct number of images?
90° — 4 images
60° — 6 images
45° — 8 images
120° — 2 images
27.
Images can be real or virtual. Which example is given the correct image type?
Projected cinema image — real
Plane mirror image — real
Cinema image — virtual
Plane mirror image — magnified
28.
In the ray-box experiment on reflection, which is the independent variable?
The angle of reflection
The brightness of the ray box
The size of the mirror
The angle of incidence
29.
Following the pattern in the table, the number of images at 45° is _____.
7
8
6
9
30.
A 25 cm tall vase is placed 40 cm in front of a plane mirror; its image is _____ tall.
50 cm
12.5 cm
40 cm
25 cm
31.
The left-right reversal of an image in a plane mirror is called _____.
dispersion
lateral inversion
refraction
diffuse reflection
32.
Parallel rays remain parallel after _____ reflection.
diffuse
total internal
specular
lateral
33.
A ray reflects off a mirror at 30° to the normal; the angle between the reflected ray and the mirror surface is _____.
30°
90°
120°
60°
34.
In the diagram, point C cannot be the image because it is twice as far behind the mirror as O is in front. True or false?
Dr Dabour Hub Academy - figure 8
False, C is the image
False, C is too high
True
True only for curved mirrors
35.
The data in the table support the rule that image distance equals object distance for a plane mirror. True or false?
False, image distance is double
False, image distance is half
True only for 10 cm
True
36.
The table shows the reflected ray turns through twice the angle the mirror turns. True or false?
False, it turns the same angle
False, it turns half the angle
True
True only at 5°
37.
For the rays in the table, ray R has the smallest angle of reflection, 20°. True or false?
False, ray P has the smallest angle of reflection
False, ray R has an angle of reflection of 70°
True
True only for ray Q
38.
The angle of incidence is measured between the incident ray and the mirror surface. True or false?
False, it is measured from the normal
True
True only for curved mirrors
False, it is measured from the reflected ray
39.
The image in a plane mirror is virtual and cannot be formed on a screen. True or false?
False, it is real
True
False, it can be focused on a screen behind the mirror
True only for large mirrors
40.
In diffuse reflection from rough paper, individual rays do not obey the law of reflection. True or false?
True
True only for white paper
False, each ray obeys i = r, but the normals point in different directions
False, rough surfaces absorb all light
41.
Reflection changes the frequency of light. True or false?
True
True only for coloured light
False, it only changes speed
False, speed, frequency and wavelength are unchanged
42.
A ray hitting a mirror along the normal is reflected straight back along its path. True or false?
True
False, it is reflected at 90°
False, it passes through the mirror
True only for concave mirrors
43.
Lateral inversion is why the word AMBULANCE is printed back to front on the front of ambulances. True or false?
False, it is for decoration only
True
False, mirrors invert images upside down
True only at night
44.
Moving further away from a plane mirror lets you see more of your body in it. True or false?
True
True only for mirrors taller than you
False, the fraction of your body you see does not depend on distance
False, you see less of yourself
45.
The incident ray, the reflected ray and the normal all lie in the same plane. True or false?
False, the normal is in a different plane
True only for diffuse reflection
False, the reflected ray is always perpendicular to the plane
True
46.
Still water gives specular reflection, which is why clear images of trees can be seen in a calm lake. True or false?
True
False, water gives only diffuse reflection
False, lakes form real images
True only at night
47.
A plane mirror image is the same distance behind the mirror as the object is in front. True or false?
False, it is twice as far behind
True
False, it is on the mirror surface
True only for small objects
48.
A real image is formed where light rays actually meet. True or false?
False, real images are where rays appear to come from
False, real images are always upright
True
True only in plane mirrors
49.
Two mirrors at 90° form 4 images of an object between them. True or false?
True
False, they form 2 images
False, they form infinitely many
False, they form 3 images
50.
Marking the reflected ray with two crosses placed far apart improves the accuracy of the measured angle. True or false?
False, crosses should be as close as possible
False, crosses make no difference
True
True only for angles above 60°
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Part of Reflection and Refraction — see every lesson and quiz in this unit.
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