- (µf)a unit of spectral radiance used in optical and communications engineering, equal to 10-6 flick, or 1 microwatt per steradian per square centimeter of surface per micrometer of span in wavelength. This is mathematically equivalent to 10 milliwatts per steradian per cubic meter.
Dictionary of units of measurement. 2015.
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µf — see microflick … Dictionary of units of measurement