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单词 reciprocity law
释义

Definition of reciprocity law in English:

reciprocity law

noun
Photography

  • The principle that the degree of darkening of an ideal emulsion is constant for a given incident energy, i.e. for a given product of light intensity and exposure time.

Origin

Early 20th century; earliest use found in Scientific Abstracts.

Definition of reciprocity law in US English:

reciprocity law

noun
Photography

  • The principle that the degree of darkening of an ideal emulsion is constant for a given incident energy, i.e. for a given product of light intensity and exposure time.

Origin

Early 20th century; earliest use found in Scientific Abstracts.
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更新时间：2025/7/1 17:15:07