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7 Geometric Optics Online Quiz Questions

Use this free practice quiz with 20 questions to review 7 Geometric Optics, test your knowledge, and prepare for your next test or exam.

20 questions
01
Choose one
1 point

A ray diagram is being used to predict how light interacts with an object. Which situation best supports using the geometric-optics model?

  1. A

    The objects are much smaller than the wavelength of light.

  2. B

    The objects are much larger than the wavelength of light.

  3. C

    The light has no wavelength.

  4. D

    The light travels only through a vacuum.

02
True or false
1 point

Under the sign convention in geometric optics, a diverging lens has a positive focal length.

  1. A

    True

  2. B

    False

03
Fill in the blank
1 point

The eye changes the shape of its lens to focus on objects at different distances. This adjustment is called .

04
Choose one
1 point

A convex mirror is used to provide a wide field of view. What kind of image does it form?

  1. A

    Real, inverted, and enlarged

  2. B

    Virtual, inverted, and reduced

  3. C

    Virtual, upright, and reduced

  4. D

    Real, upright, and the same size

05
Fill in the blank
1 point

For reflection, the angles of incidence and reflection are measured from the , and the angle of reflection is to the angle of incidence.

06
Choose one
1 point

An object is placed in front of a plane mirror. Which description correctly relates its image to the object?

  1. A

    It is upright and virtual, the same size as the object, and the same distance behind the mirror as the object is in front.

  2. B

    It is inverted and real, and can be projected onto a screen.

  3. C

    It is upright and real, and appears twice as far behind the mirror as the object is in front.

  4. D

    It is virtual and reduced, regardless of the object’s distance.

07
True or false
1 point

At oblique incidence, a light ray entering a material with a higher refractive index bends toward the normal.

  1. A

    True

  2. B

    False

08
Choose all
1 point

Which statements correctly describe the three principal rays for a thin converging lens? Select all that apply.

  1. A

    A ray parallel to the optical axis refracts through the far focal point.

  2. B

    A ray through the center of the lens continues approximately straight.

  3. C

    A ray directed through the near focal point emerges parallel to the optical axis.

  4. D

    A ray parallel to the optical axis continues parallel after passing through the lens.

09
Choose all
1 point

Which statements correctly describe image formation or focusing in the eye and a camera? Select all that apply.

  1. A

    A camera’s converging lens focuses a real image onto film or an electronic sensor.

  2. B

    The eye focuses a real, inverted image on the retina.

  3. C

    The eye changes lens shape to focus on objects at different distances.

  4. D

    A camera forms a virtual image on its sensor.

10
Choose one
1 point

A converging lens is used as a simple magnifier with the object inside its focal length. What kind of image does it form?

  1. A

    A real, inverted, reduced image

  2. B

    A virtual, upright, enlarged image

  3. C

    A real, upright, enlarged image

  4. D

    A virtual, inverted, same-size image

11
Written response
1 point

A converging lens has focal length f=12 cmf=12\,\text{cm}, and an object is 36 cm36\,\text{cm} from the lens. Using the thin-lens equation and the stated sign convention, what is the image distance?

12
Written response
1 point

A real image forms 45 cm45\,\text{cm} from a lens when the object is 30 cm30\,\text{cm} from it. Using m=−didom=-\frac{d_i}{d_o}, what is the signed linear magnification?

13
Open ended
1 point

Explain how a refracting telescope and a reflecting telescope differ in the element they use to collect and focus light. Include one advantage of the reflecting design described here.

14
Choose one
1 point

For a simple magnifier whose final image is at infinity, which expression approximates its angular magnification using the conventional near point?

  1. A

    25 cmf\frac{25\,\text{cm}}{f}

  2. B

    f25 cm\frac{f}{25\,\text{cm}}

  3. C

    25 cmdo\frac{25\,\text{cm}}{d_o}

  4. D

    do25 cm\frac{d_o}{25\,\text{cm}}

15
True or false
1 point

A real image forms where light rays actually converge and can be projected onto a screen.

  1. A

    True

  2. B

    False

16
Choose one
1 point

An object is 2.0 m in front of a plane mirror. How far behind the mirror does its image form?

  1. A

    The image is 1.5 m behind the mirror.

  2. B

    The image is 2.0 m behind the mirror.

  3. C

    The image is 4.0 m behind the mirror.

  4. D

    The image is 6.0 m behind the mirror.

17
Choose one
1 point

Parallel rays approach a diverging thin lens. Which description best identifies their paths after they pass through the lens?

  1. A

    The rays converge at a real focal point on the far side of the lens.

  2. B

    The rays continue parallel to the optical axis.

  3. C

    The rays spread apart and appear to originate from a virtual focal point on the incident side.

  4. D

    The rays reflect back along their incoming paths.

18
Choose one
1 point

An object is placed between a concave mirror and its focal point. What kind of image does the mirror form?

  1. A

    It is virtual, upright, and enlarged.

  2. B

    It is real, upright, and reduced.

  3. C

    It is real, inverted, and enlarged.

  4. D

    It is virtual, inverted, and reduced.

19
Written response
1 point

Light travels at 2.00×108 m/s2.00\times10^8\,\text{m/s} in a material. Using c=3.00×108 m/sc=3.00\times10^8\,\text{m/s}, calculate the material’s dimensionless refractive index nn.

20
Written response
1 point

An optical system forms an image at signed distance di=−10 cmd_i=-10\,\text{cm} from an object at do=20 cmd_o=20\,\text{cm}. Using m=−didom=-\frac{d_i}{d_o}, what is the signed, dimensionless linear magnification?