Have You Seen The Light?
How much do you know about the science of light and how it affects security?
- 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
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