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PSE 212 Test #2 Questions and Correct
Answers/ Latest Update / Already Graded
Three Elements Effecting Optical Properties
Ans: Light Source - reflectance curve that measures the
intensity of reflected light. as a function of wavelength
Material (object) - usually the variable in the measurement.
Detector - may be an instrument; will be selectively sensitive to
certain wavelengths.
Reflectance
Ans: The intensity of reflected light at a particular wavelength
relative to a perfect diffuse reflecting material.
Reflectance Measurements
Ans: Most measurements made in the industry are made in the
blue region of the wavelength spectrum (~450 - ~550 nm).
Subscript on R Values
Ans: Indicates the number of paper sheets backing the sample
sheet.
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R_0
Ans: Zero indicates no backing paper sheet (just a black body)
R_Infinity
Ans: Infinite number of backing sheet
R_89
Ans: Backed with 89% reflectance body
Brightness of a Paper Sheet
Ans: R_Infinity at 457 nm
Kubella Munk Theory
Ans: A theory that uses thin layer made up of small particles to
describe the interaction of light with a material. 2 coefficients
are determined using this theory, the scattering coefficient, S,
and the absorption coefficient, K.
The scattering coefficient, S, is created by:
All rights reserved © 2025/ 2026 |
PSE 212 Test #2 Questions and Correct
Answers/ Latest Update / Already Graded
Three Elements Effecting Optical Properties
Ans: Light Source - reflectance curve that measures the
intensity of reflected light. as a function of wavelength
Material (object) - usually the variable in the measurement.
Detector - may be an instrument; will be selectively sensitive to
certain wavelengths.
Reflectance
Ans: The intensity of reflected light at a particular wavelength
relative to a perfect diffuse reflecting material.
Reflectance Measurements
Ans: Most measurements made in the industry are made in the
blue region of the wavelength spectrum (~450 - ~550 nm).
Subscript on R Values
Ans: Indicates the number of paper sheets backing the sample
sheet.
All rights reserved © 2025/ 2026 |
, Page |2
R_0
Ans: Zero indicates no backing paper sheet (just a black body)
R_Infinity
Ans: Infinite number of backing sheet
R_89
Ans: Backed with 89% reflectance body
Brightness of a Paper Sheet
Ans: R_Infinity at 457 nm
Kubella Munk Theory
Ans: A theory that uses thin layer made up of small particles to
describe the interaction of light with a material. 2 coefficients
are determined using this theory, the scattering coefficient, S,
and the absorption coefficient, K.
The scattering coefficient, S, is created by:
All rights reserved © 2025/ 2026 |
