Transmittance
Laboratory > Optical
| Optical transmittance | |
| Transmittance (ASTM D1003) | |
The optical transmittance is defined as the fraction of incident light, at a specified wavelength, that passes through a sample. Optical transmittance refers to the amount of light that a body goes through, at a certain wavelength. When a beam of light falls on a translucent body, a part of that light is absorbed by it, and another fraction of that beam of light will cross the body, according to its transmittance. The value of the optical transmittance of an object can be determined according to the following expression: Transmittance = P / P0 Where: T = Transmittance P = Intensity of transmitted light P0 = Intensity of incident light |   |