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  • What is the difference between reflectivity and reflectance?
    Reflectivity is the square of the magnitude of the ratio of the reflected electric field to the incident electric field at a surface boundary Reflectance is the ratio of the total reflected power to the total incident power For an infinitely thick material, reflectivity and reflectance are the same For thin or layered materials, the reflectivity of the back surfaces contribute to the
  • Why is there emissivity + reflectivity + transmittance = 1?
    Reflectivity, Absorptivity, and Transmissivity are defined as being fractions of the original incident light So you could have 30% reflected, 10% absorbed, and then you would know 60% was transmitted since the remaining light had to go somewhere (conservation of energy), for a total of 100% which is equal to 1
  • Why do metals have high optical reflectivity? - Physics Stack Exchange
    Why do metals have high optical reflectivity? Ask Question Asked 6 years, 10 months ago Modified 6 years, 1 month ago
  • electromagnetic radiation - The rule breaker, emissivity + reflectivity . . .
    If emissivity and reflectivity are inversely proportionate, why does glass have a high emissivity of around 0 95-0 97 as well as being very reflective for IR Radiation? normally it works but not w
  • optics - Calculating absorption coefficient from Transmittance and . . .
    I have some spectrum data from a sample, specifically the Transmittance and Reflectance of the sample I would like to use this to calculate the absorption coefficient I found a here with an equat
  • Reflectivity with complex refraction indices - Physics Stack Exchange
    in case of air glass n is real, but for, say, semiconductors or metals, where radiation is absorbed, n is a complex number, with n _ = nr − ik k is described as the extinction coefficient and is related to the absorption coefficient with α = 4πk λ, λ being the wavelength I am looking to derive a formula for the reflectivity which only includes the real and imaginary parts of the
  • UV reflective surfaces - Physics Stack Exchange
    In physics, the reflectivity of a surface is described by Fresnel Equations One of the parameters of this equations is the refractive index which in general depends on the wavelength of light used So surfaces that reflect visible light need not be good reflectors in another wavelength A very good example of this is the phosphorescent coating that you find inside fluorescent lights These
  • quantum mechanics - How do metals reflect electromagnetic radiation . . .
    Microwaves, for example, can be reflected off metallic surfaces This seems counter-intuitive, since the metal's electrons could interact with the electric field component of the EM wave and absorb
  • What is the relation between reflectance and intensity?
    If the authors plot intensity rather than reflectance, it's probably because the absolute reflectance is not of interest to the study at hand The interest could me more focused on the location in wavelength of features such as peaks and valleys The interest is to extract information about the system from the wavelengths Absolute reflectance is difficult to measure Intensity is considerably
  • Refractive Index and Reflection - Physics Stack Exchange
    Absolutely See Fresnel's equations These show that reflection depends on angle of incidence, polarization, and refractive index The simplest case (for reflection at normal incidence, where polarization doesn't matter) tells us that the reflectance is





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