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Definition of "Access Channels" |
Access channels made available to community members, either for free or lease basis. Cable operators aren’t allowed editorial control on these channels, except to refuse programming with obscene or indecent content. / Zone plate is a device used to focus light or other things exhibiting wave character.Unlike lenses or curved mirrors however, zone plates use diffraction instead of refraction or reflection. Based on analysis by Augustin-Jean Fresnel, they are sometimes called Fresnel zone plates in his honor. The zone plate's focusing ability is an extension of the Arago spot phenomenon caused by diffraction from an opaque disc. |
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