Have You Seen The Light?

15 Questions | Total Attempts: 81

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Light Quizzes & Trivia

How much do you know about the science of light and how it affects security?


Questions and Answers
  • 1. 
    The ____________ is the adjustment of the lens opening, which controls the amount of light allowed to pass through the lens.
    • A. 

      Iris

    • B. 

      Shutter speed

    • C. 

      Glass elements

    • D. 

      Aperture

  • 2. 
    Luminous flux is ____________.
    • A. 

      Fluorescent and used to solder stained glass

    • B. 

      The SI unit of illuminance and luminous emittance

    • C. 

      Used in the 1985 movie “Back to the Future” to power the DeLorean

    • D. 

      What occurs in an office when the owner is away

  • 3. 
    Surfaces that are illuminated with standard daylight have an average illuminance of ____________ lux. 
    • A. 

      10,000 – 25,000

    • B. 

      5,000

    • C. 

      100,000

    • D. 

      67,500

  • 4. 
    Sodium vapor lighting generally emits a bright white light that looks like daylight.
    • A. 

      True

    • B. 

      False

  • 5. 
    The lux is equal to ____________ lumen per square ____________.
    • A. 

      Ten / acre

    • B. 

      One / foot

    • C. 

      Five / mile

    • D. 

      One / meter

  • 6. 
    Infrared lighting has a longer wavelength than visible lighting.
    • A. 

      True

    • B. 

      False

  • 7. 
    Light is ____________ energy that is visible to the human eye.
    • A. 

      Concave

    • B. 

      Convex

    • C. 

      Radiant

    • D. 

      Reflected

  • 8. 
    The visible light spectrum runs from ____________ nanometers.
    • A. 

      380 – 750

    • B. 

      100 – 450

    • C. 

      50 – 75

    • D. 

      1275 – 3200

  • 9. 
    The aperture has an effect on the depth of field.
    • A. 

      True

    • B. 

      False

  • 10. 
    The “glow” from infrared lighting sources typically can not be seenat ranges starting at about ____________ nanometers.
    • A. 

      380 – 700

    • B. 

      650 – 700

    • C. 

      700 – 900

    • D. 

      900 – 1000

  • 11. 
    To keep an image sharp, which of the following lens types is the proper one to use when a camera must switch from visible light to infrared light viewing?
    • A. 

      Multi-element

    • B. 

      Spherical

    • C. 

      Auto iris

    • D. 

      Aspherical

  • 12. 
    A Fresnel lens can typically be seen in ____________.
    • A. 

      A color IP camera

    • B. 

      Standard CCTV cameras

    • C. 

      CCTV cameras with built in auto iris

    • D. 

      A motion detector

  • 13. 
    CIF is short for ____.
    • A. 

      Commercial Industrial Format

    • B. 

      Camera Identification Frame

    • C. 

      Common Intermediate Format

    • D. 

      Compressed Indexed Frame

  • 14. 
    The larger the f-stop number, the larger the depth of field.
    • A. 

      True

    • B. 

      False

  • 15. 
    One foot-candle is equal to one lumen per square foot or approximately ____________ lux.
    • A. 

      10.764

    • B. 

      1

    • C. 

      36

    • D. 

      144