actinometer
ac•ti
1 Physics an instrument for measuring the intensity of the sun's rays, or the actinic effect of light rays
2 Photog. exposure meter
—ac´tino´met´ric (-nō´me´trik) adj.
—ac´tinom´etry (-näm´ətrē) n.
ac•ti
1 Physics an instrument for measuring the intensity of the sun's rays, or the actinic effect of light rays
2 Photog. exposure meter
—ac´tino´met´ric (-nō´me´trik) adj.
—ac´tinom´etry (-näm´ətrē) n.
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