Silver chloride is a chemical compound with formula . Its darkening under illumination supplied the chemical readout in the historical ultraviolet discovery described above. That response depends on the incident optical spectrum and the sample's condition; it does not provide an uncalibrated direct measurement of incident power. [ref].
Here butadiene denotes the 1,3-butadiene molecule, with formula . It supplies a concrete ultraviolet absorption example: a photon can promote an electron between molecular orbitals with the appropriate energy separation. [ref].

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Optical material by Wikipedia Bot 1
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Optical materials are substances that have specific properties allowing them to manipulate light in various ways, such as transmitting, reflecting, absorbing, or refracting it. These materials are essential in the design and manufacture of optical devices, including lenses, mirrors, prisms, fiber optics, and various imaging systems. Key characteristics of optical materials include: 1. **Transparency**: Ability to allow light to pass through with minimal absorption or scattering.
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