Definition: Adjective: (1) ~ negative, ~ slide: one that has low density of silver or dye. It has been under-exposed or under-developed, or both. (2) ~ film: a layer of material deposited in an extremely thin layer e.g. a few atoms thick. * Used in production of micro-chips, photo-detectors, anti-reflection coatings, etc. (3) ~ lens: one that, for computational purposes, is taken as having no thickness e.g. simple magnifying glass, eye-piece correction or spectable lenses.* The simple lens formulae apply only to thin lenses.

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