2023年8月2日 · 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 …

2017年8月29日 · 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.

2018年8月26日 · You are asking why metals have highly optical reflectivity. Now this has too a little bit to do with why metals are often silver. The same goes why we use aluminum in our mirrors. When a photon interacts with an atom in the metal, three things can happen: elastic scattering, the photon keeps its energy level and phase and changes angle

2013年4月3日 · So if the emissivity is high for infra-red that doesn't clash with the reflectivity being high for visible light. This (or rather it's converse) is exactly why greenhouses heat up in visible light. They have a high emissivity and low reflectivity at visible wavelengths but a low emissivity and high reflectivity at IR wavelengths.

2012年4月24日 · 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.

2017年3月24日 · As far as I can tell, the equation above gives the reflectivity as long as the norm of the index is known, that is $$ n_1=\sqrt{n_{r_1}^2+k_1^2} \\ n_2=\sqrt{n_{r_2}^2+k_2^2} $$ in the above formula for the reflectivity, I replaced the norms of the complex numbers and not the numbers themselves,obviously.

2018年8月22日 · I am trying to write a code that calculates Neutron/X-ray reflectivity profile of a multilayered system using Parrat algorithm.

2014年6月3日 · The reason for going with silver rather than aluminium is a slightly improved reflectivity in the near- and mid-infrared (99.1 per cent at 10 microns), but also that the emissivity of the silver coating is around 38% that of aluminium, which reduces background in …

2017年8月14日 · Absolutely. See Fresnel's equations.. These show that reflection depends on angle of incidence, polarization, and refractive index.

2015年5月25日 · As for reflectivity, it depends on the angle of incident on the surfaco of the material and properties as ...