What is the formula for reflectivity?

Reflectivity can be calculated as p(y) = Gr(y)/Gi(y) where p is the reflectivity, y is the wavelength of the light, Gr is the reflected radiation and Gi is the incident radiation.

Does reflectivity depend on wavelength?

Reflectivity depends on the wavelength of light, direction of the incident and reflected light, polarization of light, type of the material (metal, plastic, etc.), chemical composition and structure of the material, and state of the material and its surface (temperature, surface roughness, degree of oxidation and …

What is the reflectivity of metals?

In metals, the reflectivity is typically on the order of 0.90-0.95, whereas for glasses it is close to 0.05. The high reflectivity of metals is one reason that they are opaque. High reflectivity is desired in many applications including mirrors, coatings on glasses, etc.

How do you calculate reflectivity from refractive index?

The value of reflectivity as a function of an incident angle may be calculated using Fresnel’s formulas if refractive index n and absorption index χ of sample material are known. where n21 = n2/nh and θ is an incident angle of radiation from first medium onto the second relative to the surface normal.

What is the difference between reflectance and reflectivity?

Reflectance is a fraction of electromagnetic power reflected form material or surface. Reflectivity is a property of a material.

What is the reflectivity of Aluminium?

Metal Mirror » Bare Aluminum Bare Aluminum offers greater than 86% reflectance from near UV to mid IR. Aluminum will slowly oxidize, resulting in a significant loss of reflectance in the UV, and slight scattering throughout the spectrum. Therefore, it is best if aluminum has a protective dielectric overcoat.

What is the reflection of light and shininess of metals?

If the surface is smooth and shiny, like glass, water or polished metal, the light will reflect at the same angle as it hit the surface. This is called specular reflection. Light reflects from a smooth surface at the same angle as it hits the surface.

What are the Fresnels formula for perpendicular and parallel polarization?

These are Fresnel’s equations for perpendicular polarization. For normal incidence, θI = θT = 0, α = 1 and they reduce to the equations we got in that case. For θI = 0 (normal incidence) 80% of the amplitude is transmitted, dropping to zero when θI = π/2 (incident wave is parallel to the surface).

What is the reflectivity of water?

The refLectivity contrast between sea and pure water at radio frequencies is approximateLy 44%. Present techniques for aerial detection of coastal springs or estuarine outflows involve remote measurement of temperature or color.

How do you calculate the amount of light reflected at normal incidence?

Reflectance at normal incidence is given by R = [(n-1)2+ κ]/[(n+1) + κ2] At nonnormal incidence, polarization becomes important and the amount of light reflected at an interface depends on the polarization of the incident wave, which is usually a combination of sand p components. If θ 1 is the angle of incidence (AOI) and θ

How to calculate reflectance in thin films?

Reflectance in Thin Films Reflectance at normal incidence is given by R = [(n-1)2+ κ]/[(n+1) + κ2] At nonnormal incidence, polarization becomes important and the amount of light reflected at an interface depends on the polarization of the incident wave, which is usually a combination of sand p components. If θ 1

What is reflectance (R)?

Abstract Reflectance (R) is the fraction of incident light reflected from a surface and is an intrinsic optical property of thin films. It is essential in determining color, transparency and polarization characteristics of the film. Total internal reflectance is also important in devices such as optical waveguides.

How do you calculate the specular reflection from a body of water?

Specular reflection from a body of water is calculated by the Fresnel equations. Fresnel reflection is directional and therefore does not contribute significantly to albedo which primarily diffuses reflection. A real water surface may be wavy.