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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

16.3 Lenses and Curved Mirrors – Quiz

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Lenses and Curved Mirrors American Physics quiz: free practice for American System Physics. Work through this Lenses and Curved Mirrors American Physics quiz and get instant feedback on every answer. If you get stuck, review the 16.3 Lenses and Curved 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.
Use the ray diagram (converging lens, focal length 10 cm). Where does the image form and what is it like?
Dr Dabour Hub Academy - figure 1
At 15 cm on the far side; real, upright, same size
At 30 cm on the object side; virtual, upright
At 10 cm; real, inverted, diminished
At 30 cm on the far side; real, inverted, enlarged
2.
The object in this ray diagram sits beyond 2F. Describe the image formed.
Dr Dabour Hub Academy - figure 2
Real, inverted, diminished, about 17 cm from the lens
Virtual, upright, enlarged
Real, inverted, enlarged, beyond 2F
Real, upright, same size at 2F
3.
In the ray diagram the object is between F and the lens. Why are dashed lines drawn to the left of the lens?
Dr Dabour Hub Academy - figure 3
They show real light travelling backwards
The refracted rays diverge, so they are traced back to find where they appear to come from: a virtual image
They show the rays reflected by the lens
They mark the shadow of the object
4.
The ray diagram shows an object in front of a diverging lens. Which statement describes the image?
Dr Dabour Hub Academy - figure 4
Real, inverted, same size at 2F
Virtual, inverted, enlarged
Real, upright, diminished on the far side
Virtual, upright, diminished, between F and the lens on the object side
5.
The diagram shows a concave mirror with focal length 10 cm and an object 25 cm away. Where is the image?
Dr Dabour Hub Academy - figure 5
About 17 cm in front of the mirror, real and inverted
Behind the mirror, virtual and upright
At C, same size
At F, a point image
6.
The graph of 1/di against 1/do is a straight line with gradient −1. Its y-intercept is about 0.0667 cm⁻¹. What is the focal length?
Dr Dabour Hub Academy - figure 6
0.067 cm
15 cm
6.7 cm
30 cm
7.
The diagram shows light from a distant object focusing inside an eye. Which defect is shown and how is it corrected?
Dr Dabour Hub Academy - figure 7
Long sight; a converging lens
Short sight; a converging lens
Short sight; a diverging lens
Long sight; a diverging lens
8.
Using the results in the table, what is the focal length of the lens?
30.0 cm
7.5 cm
15.0 cm
60.0 cm
9.
Which row in the table is most likely a mistake for a lens of focal length 15 cm?
do = 30.0 cm, di = 45.0 cm
do = 20.0 cm, di = 60.0 cm
do = 25.0 cm, di = 38.0 cm
do = 40.0 cm, di = 24.0 cm
10.
Using the table, which lens would correct short sight, and what is its power?
A, +2.0 D
B, −4.0 D
C, +5.0 D
B, +4.0 D
11.
A student places a candle at various distances from a concave mirror and catches the image on a card. What focal length do the results in the table give?
20 cm
10 cm
5 cm
15 cm
12.
The table shows four attempts to find the sharpest image with the object 30.0 cm from a lens. What focal length does the mean image distance give?
30.0 cm
7.5 cm
15.0 cm
60.0 cm
13.
An object is 30 cm from a converging lens of focal length 12 cm. How far from the lens is the image?
20.0 cm
8.57 cm
18.0 cm
17.1 cm
14.
A slide projector lens has f = 20 cm and the slide is 25 cm from it. How far away must the screen be placed for a sharp image?
11.1 cm
100 cm
5.00 cm
22.2 cm
15.
A camera lens with f = 15 cm photographs a small toy 45 cm away. At what distance behind the lens must the sensor be?
11.2 cm
30.0 cm
22.5 cm
30.8 cm
16.
A magnifying glass of focal length 10 cm is held 6.0 cm from a stamp. What is the image distance (US sign convention)?
15.0 cm
3.75 cm
16.0 cm
-15.0 cm
17.
A lens forms a real image 60 cm from the lens of an object 20 cm away that is 1.5 cm tall. How tall is the image?
4.50 cm
0.500 cm
0.375 cm
1.50 cm
18.
A camera 40 cm from an 8.0 cm tall flower forms a real image 10 cm behind the lens. What is the height of the flower's image?
32.0 cm
2.00 cm
6.40 cm
8.00 cm
19.
What is the power of a converging lens with focal length 25 cm?
0.250 D
0.0400 D
4.00 D
25.0 D
20.
A reading-glasses lens brings sunlight to a focus 40 cm from the lens. What is its power?
0.400 D
0.0250 D
40.0 D
2.50 D
21.
An optometrist prescribes a lens of power −2.5 D. What type of lens and focal length is this?
Diverging, focal length 40 cm
Converging, focal length 40 cm
Diverging, focal length 2.5 cm
Converging, focal length 2.5 m
22.
A concave mirror has a radius of curvature of 30 cm. What is its focal length?
30 cm
15 cm
60 cm
7.5 cm
23.
A concave mirror is part of a sphere of radius 50 cm. How far from the mirror is its principal focus?
50 cm
100 cm
25 cm
12.5 cm
24.
A concave make-up mirror (f = 15 cm) faces a lamp 40 cm away. Where does the mirror form an image of the lamp?
10.9 cm
25.0 cm
-24.0 cm
24.0 cm
25.
A diverging lens has f = −20 cm. An object is placed 30 cm away. What is the image distance?
-12.0 cm
12.0 cm
24.0 cm
60.0 cm
26.
Converging lenses are used in different devices depending on object position. Which position is linked to the correct device?
At F — magnifying glass
Between F and lens — projector
Beyond 2F — camera
At 2F — spotlight
27.
An optometrist corrects vision defects with lenses. Which defect is linked to the right lens?
Short sight — converging lens
Long sight — diverging lens
Short sight — plane glass
Long sight — converging lens
28.
A diagram key defines lens vocabulary. Which term is given its correct meaning?
Optical centre — point through which rays pass undeviated
Principal focus — centre of the lens
Focal length — lens thickness
Principal axis — edge of the lens
29.
Curved mirrors have everyday jobs. Which mirror is given a suitable use?
Convex — solar furnace
Concave — make-up/shaving mirror
Concave — car wing mirror for wide view
Plane — torch reflector
30.
The image formed by a converging lens depends on where the object is. Which position is listed with the correct image description?
Beyond 2F — virtual, enlarged
Between F and lens — real, inverted
At 2F — real, inverted, same size
Between F and 2F — real, diminished
31.
Using the magnification equation, the missing image height in the table is _____.
1.0 cm
4.0 cm
2.0 cm
0.5 cm
32.
A photocopier lens (f = 8 cm) copies a document at the same size. The copy is formed _____ from the lens.
8 cm
16 cm
4 cm
32 cm
33.
Lens power is measured in _____.
watts
metres
lux
dioptres
34.
A magnifying glass is used with the object _____ the principal focus.
closer to the lens than
exactly at
beyond 2F from
twice as far as
35.
For a concave mirror, focal length is equal to _____ the radius of curvature.
twice
half
equal to
one quarter of
36.
The image in this ray diagram is upright, enlarged and on the same side as the object. True or false?
Dr Dabour Hub Academy - figure 8
False, it is inverted and real
False, it is diminished
True
True only if a screen is used
37.
In the table, the row do = 30 cm, di = 30 cm shows the object at 2F, giving a same-size image. True or false?
False, the object is at F
False, the image is twice the size
True only for mirrors
True
38.
In the table, lens C is the most powerful converging lens, with a power of +5.0 D. True or false?
False, lens A is more powerful
False, lens C has a power of +0.05 D
True
True only if C is diverging
39.
A converging lens is thicker in the middle than at its edges. True or false?
False, it is thinner in the middle
False, it has the same thickness everywhere
True
True only for glass lenses
40.
A diverging lens can form a real image on a screen. True or false?
True
True if the object is beyond 2F
True only for bright objects
False, a diverging lens always gives a virtual, upright, diminished image of a real object
41.
An object placed exactly at F of a converging lens gives no image because the rays emerge parallel. True or false?
True
False, the image is at 2F
False, the image is virtual and diminished
True only for mirrors
42.
A projector places the slide between F and 2F so that a real, enlarged, inverted image forms beyond 2F. True or false?
False, the slide is placed inside F
True
False, the image is diminished
True only for concave lenses
43.
A thicker, more curved converging lens has a longer focal length. True or false?
True
True only for plastic lenses
False, it has a shorter focal length and greater power
False, curvature has no effect
44.
Short sight (myopia) is corrected with a converging lens. True or false?
True
True only for children
False, it cannot be corrected
False, it is corrected with a diverging lens
45.
A convex mirror always forms a virtual, upright, diminished image. True or false?
True
False, it forms real images
False, the image is enlarged
True only beyond 2F
46.
A ray through the optical centre of a thin lens passes straight through without deviation. True or false?
False, it bends through F
True
False, it is reflected
True only for diverging lenses
47.
Convex mirrors are used on shop walls and road bends because they give a wide field of view. True or false?
False, they magnify distant objects
False, they form real images for security cameras
True
True only at night
48.
An image with negative magnification in the sign convention is inverted. True or false?
False, it is upright
False, negative magnification means virtual
True only for mirrors
True
49.
Long sight (hyperopia) blurs near objects because the eye focuses light behind the retina. True or false?
True
False, it focuses in front of the retina
False, it blurs distant objects
True only for older adults
50.
Moving an object from far away towards F of a converging lens makes the real image move further from the lens and become larger. True or false?
False, the image moves closer and shrinks
True
False, the image stays at F
True only for diverging lenses
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Part of Reflection and Refraction — see every lesson and quiz in this unit.
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