Have You Seen The Light?

15 Questions | By Vankirkad | Updated: Mar 21, 2022 | Attempts: 106

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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