I am wondering what happens to the remaining 99% of the radiation after the first foil in your thought experiment. The reflection will depend on the Dielectric constant of the foil. See this link on Fresnel Equations.Christofer Br said:That is, transmission is 0.5%
It will be reflected, the foil is a conductor (lets assume it's gold because it has relatively constant emissivity across a very broad spectrum, exact properties are not important) - so it REFLECTED 99% and emitted additional 0.5% in one directionsophiecentaur said:I am wondering what happens to the remaining 99% of the radiation after the first foil in your thought experiment. The reflection will depend on the Dielectric constant of the foil. See this link on Fresnel Equations.
Just consider that all the light is either reflected or absorbed, and the absorbed light is immediately emitted equally in both directions perpendicular to the plane of the foil (thats why I insisted on an infinitely thin foil, so we can ignore emmisions from the "sides")sophiecentaur said:An "infinitely thin" foil is a bit too much of an abstraction for this question. Loads of light will pass through a thin enough gold foil. Just how thick are you suggesting?
You are assuming that the transmitted light is not relevant here then? I have a problem with that.Christofer Br said:Just consider that all the light is either reflected or absorbed, and the absorbed light is immediately emitted equally in both directions perpendicular to the plane of the foil (thats why I insisted on an infinitely thin foil, so we can ignore emmisions from the "sides")
Transmissivity is a measure of how much light or radiation is able to pass through a material. It is important to calculate because it helps us understand the properties and capabilities of a material, such as reflective foils, and how it may affect the transmission of light or radiation in a given system.
The transmissivity of reflective foils can be affected by several factors, including the composition of the foil (i.e. what it is made of), the thickness of the foil, the surface texture or finish, and the angle at which the light or radiation is hitting the foil.
To calculate the transmissivity of a set of reflective foils, you will need to measure the amount of light or radiation that is transmitted through the foils and compare it to the amount of light or radiation that is incident upon the foils. This can be done using a spectrophotometer or by using mathematical equations that take into account the various factors that affect transmissivity.
Yes, the transmissivity of reflective foils can be modified or improved by changing the composition of the foil, altering the thickness or surface texture, or by using coatings or treatments that enhance the reflective properties of the foil.
Transmissivity and reflectivity are related but distinct properties. Transmissivity measures the amount of light or radiation that can pass through a material, while reflectivity measures the amount of light or radiation that is reflected off the surface of a material. A material with high transmissivity will allow more light or radiation to pass through, while a material with high reflectivity will reflect more light or radiation away.