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When reflection occurs from thin layers of material, internal reflection effects can cause the reflectance to vary with surface thickness. Reflectivity is the limit value of reflectance as the sample becomes thick; it is the intrinsic reflectance of the surface, hence irrespective of other parameters such as the reflectance of the rear surface.
The reflectance of a system is also sometimes called a reflection coefficient. A wave is partially transmitted and partially reflected when the medium through which it travels suddenly changes. The reflection coefficient determines the ratio of the reflected wave amplitude to the incident wave amplitude.
We call the fraction of the incident power that is reflected from the interface the reflectance (or reflectivity, or power reflection coefficient) R, and the fraction that is refracted into the second medium is called the transmittance (or transmissivity, or power transmission coefficient) T.
In 1964, Adam S. G. Curtis coined the term Interference Reflection Microscopy (IRM), using it in the field of cell biology to study embryonic chick heart fibroblasts. [1] [2] He used IRM to look at adhesion sites and distances of fibroblasts, noting that contact with the glass was mostly limited to the cell periphery and the pseudopodia.
In the event that most of the echo is from first surface reflections (^ < or so), the OC radar albedo is a first-order approximation of the Fresnel reflection coefficient (aka reflectivity) [83] and can be used to estimate the bulk density of a planetary surface to a depth of a meter or so (a few wavelengths of the radar wavelength which is ...
The tapetum lucidum in cats is renowned for its brilliance, even inspiring ancient Egyptians to believe it reflected the sun at night. This reflective layer is composed of 15-20 layers of cells arranged in a central pattern. This structure, denser than that of dogs, results in high reflectance, nearly 130 times that of humans.
The optical properties of a material define how it interacts with light.The optical properties of matter are studied in optical physics (a subfield of optics) and applied in materials science.
Gloss reflection. Gloss is an optical property which indicates how well a surface reflects light in a specular (mirror-like) direction. It is one of the important parameters that are used to describe the visual appearance of an object.