diopter

n. a unit of the power of a lens, equal to the reciprocal of its focal length in meters. A lens of 1 diopter will focus parallel rays of light to a point 1 m behind the lens.

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Psychology term of the day

February 2nd 2025

English as a second language (ESL)

Sorry, "english-as-a-second-language-esl" is not in the Dictionary of Psychology. Please report to APA if you believe this is an error.