Transmittance (noun)

The ratio of the amount of light that passes through a substance to the amount that falls on it, usually expressed as a percentage.

Origin:

The word "transmittance" is derived from the latin word "transmittere" meaning to send across, and it has been used since the 19th century.

Examples:

1. The transmittance of the glass was measured to be 80%.
2. The transmittance of a filter can be used to determine its effectiveness.
3. Transmittance is a measure of how much light passes through a material.
4. Transmittance is used in optics and photonics to measure the properties of materials.
5. Transmittance is an important property of materials used in optical systems.