Chapter 25: Optical Instruments

51 Questions | Total Attempts: 318

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Optical Instrument Quizzes & Trivia

Questions and Answers
  • 1. 
    The length of time the shutter is open and the film is exposed in a camera is determined by the
    • A. 

      Shutter speed.

    • B. 

      F-stop.

    • C. 

      Focusing.

    • D. 

      None of the given answers

  • 2. 
    The amount of light reaching the film in a camera is determined by the
    • A. 

      Shutter speed.

    • B. 

      F-stop.

    • C. 

      Focusing.

    • D. 

      None of the given answers

  • 3. 
    In a single-lens reflex camera the lens-film distance may be varied by sliding the lens forward or backward with respect to the camera housing. If, with such a camera, a fuzzy picture is obtained, this means that
    • A. 

      The lens was too far from the film.

    • B. 

      The lens was too close to the film.

    • C. 

      Too much light was incident on the film.

    • D. 

      Too little light was incident on the film.

    • E. 

      None of the given answers

  • 4. 
    A camera lens that covers the film with a field of view that corresponds approximately to that of normal vision is referred to as a
    • A. 

      Normal lens.

    • B. 

      Telephoto lens.

    • C. 

      Wide-angle lens.

    • D. 

      Zoom lens.

  • 5. 
    A camera lens that acts like a telescope to magnify images is referred to as a
    • A. 

      Normal lens.

    • B. 

      Telephoto lens.

    • C. 

      Wide-angle lens.

    • D. 

      Zoom lens.

  • 6. 
    A camera lens that covers the film with a wider field of view than that of the eye and through which objects appear smaller is referred to as a
    • A. 

      Normal lens.

    • B. 

      Telephoto lens.

    • C. 

      Wide-angle lens.

    • D. 

      Zoom lens.

  • 7. 
    In which of the following ways is a camera different from the human eye?
    • A. 

      The camera always forms an inverted image, the eye does not.

    • B. 

      The camera always forms a real image, the eye does not.

    • C. 

      The camera utilizes a fixed focal length lens, the eye does not.

    • D. 

      For the camera, the image magnification is greater than one, but for the eye the magnification is less than one.

    • E. 

      A camera cannot focus on objects at infinity but the eye can.

  • 8. 
    The principal refraction of light by the eye occurs at the
    • A. 

      Cornea.

    • B. 

      Lens.

    • C. 

      Retina.

    • D. 

      Iris.

  • 9. 
    The closest distance at which an eye can see objects clearly is
    • A. 

      The near point.

    • B. 

      The far point.

    • C. 

      Nearsightedness.

    • D. 

      Farsightedness.

  • 10. 
    The farthest distance at which an eye can see objects clearly is
    • A. 

      The near point.

    • B. 

      The far point.

    • C. 

      Nearsightedness.

    • D. 

      Farsightedness.

  • 11. 
    If a person's eyeball is too long from front to back, the person is likely to suffer from
    • A. 

      Spherical aberration.

    • B. 

      Nearsightedness.

    • C. 

      Farsightedness.

    • D. 

      Astigmatism.

  • 12. 
    Nearsightedness can usually be corrected with
    • A. 

      Converging lenses.

    • B. 

      Diverging lenses.

    • C. 

      Achromatic lenses.

    • D. 

      Cylindrical lenses.

  • 13. 
    If the human eyeball is too long from front to back, this gives rise to a vision defect that can be corrected by using
    • A. 

      Convex meniscus eyeglasses.

    • B. 

      Concave meniscus eyeglasses.

    • C. 

      Cylindrical eyeglasses.

    • D. 

      Contact lenses, but no ordinary lenses.

    • E. 

      Shaded glasses (i.e., something that will cause the iris to dilate more).

  • 14. 
    If a person's eyeball is too short from front to back, the person is likely to suffer from
    • A. 

      Astigmatism.

    • B. 

      Spherical aberration.

    • C. 

      Farsightedness.

    • D. 

      Nearsightedness.

  • 15. 
    Farsightedness can usually be corrected with
    • A. 

      Cylindrical lenses.

    • B. 

      Achromatic lenses.

    • C. 

      Diverging lenses.

    • D. 

      Converging lenses.

  • 16. 
    If the human eyeball is too short from front to back, this gives rise to a vision defect that can be corrected by using
    • A. 

      Convex meniscus eyeglasses.

    • B. 

      Concave meniscus eyeglasses.

    • C. 

      Cylindrical eyeglasses.

    • D. 

      Contact lenses, but no ordinary lenses.

    • E. 

      Shaded glasses (i.e., something that will cause the iris to dilate more).

  • 17. 
    What type of lens is a magnifying glass?
    • A. 

      Converging

    • B. 

      Diverging

    • C. 

      Spherical

    • D. 

      Cylindrical

  • 18. 
    An important reason for using a very large diameter objective in an astronomical telescope is
    • A. 

      To increase the magnification.

    • B. 

      To increase the resolution.

    • C. 

      To form a virtual image, which is easier to look at.

    • D. 

      To increase the width of the field of view.

    • E. 

      To increase the depth of the field of view.

  • 19. 
    Consider the image formed by a refracting telescope. Suppose an opaque screen is placed in front of the lower half of the objective lens. What effect will this have?
    • A. 

      The top half of the image will be blacked out.

    • B. 

      The lower half of the image will be blacked out.

    • C. 

      The entire image will be blacked out, since the entire lens is needed to form an image.

    • D. 

      The image will appear as it would if the objective were not blocked, but it will be dimmer.

    • E. 

      There will be no noticeable difference in the appearance of the image with the objective partially blocked or not.

  • 20. 
    Assuming the film used has uniform sensitivity throughout the visible spectrum, in which of the following cases would you be able to best distinguish between two closely spaced stars? (The lens referred to is the objective lens of the telescope used.)
    • A. 

      Use a large lens and blue light

    • B. 

      Use a large lens and red light

    • C. 

      Use a small lens and blue light

    • D. 

      Use a small lens and red light

  • 21. 
    A refracting telescope has a magnification m. If the objective focal length is doubled and the eyepiece focal length is halved, what is the new magnification?
    • A. 

      4m

    • B. 

      2m

    • C. 

      M/2

    • D. 

      M/4

  • 22. 
    With what color light would you expect to be able to see the greatest detail when using a microscope?
    • A. 

      Red, because of its long wavelength

    • B. 

      Yellow, because of its right wavelength

    • C. 

      Blue, because of its shorter wavelength

    • D. 

      Color does not matter.

  • 23. 
    Spherical lenses suffer from
    • A. 

      Both spherical and chromatic aberration.

    • B. 

      Spherical aberration, but not chromatic aberration.

    • C. 

      Chromatic aberration, but not spherical aberration.

    • D. 

      Neither spherical nor chromatic aberration.

  • 24. 
    Spherical mirrors suffer from
    • A. 

      Both spherical and chromatic aberration.

    • B. 

      Spherical aberration, but not chromatic aberration.

    • C. 

      Chromatic aberration, but not spherical aberration.

    • D. 

      Neither spherical nor chromatic aberration.

  • 25. 
    The resolving power of a microscope refers to the ability to
    • A. 

      Distinguish objects of different colors.

    • B. 

      Form clear images of two points that are very close together.

    • C. 

      Form a very large image.

    • D. 

      Form a very bright image.

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