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Pupillary Reflex , pupillary reflex An alteration in the size of the pupil in response to a change in the light intensity. An increase in light intensity causes both pu… intensity , in·ten·si·ty / inˈtensitē/ • n. (pl. -ties) 1. the quality of being intense: gazing into her face with disconcerting intensity the pain grew in inten… Photometry , photometry (fōtŏm´ətrē), branch of physics dealing with the measurement of the intensity of a source of light, such as an electric lamp, and with the… Actinometer , ac·ti·nom·e·ter / ˌaktəˈnämitər/ • n. Physics an instrument for measuring the intensity of radiation, typically ultraviolet radiation. Gravimeter , gravimeter An instrument for measuring the gravitational acceleration. Most field instruments are relative instruments, i.e. they determine the diffe… Measure , meas·ure / ˈmezhər/ • v. [tr.] 1. ascertain the size, amount, or degree of (something) by using an instrument or device marked in standard units or b…
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photohydrometer