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- 5. Using the WKB method, find the transmission coefficient of a potential barrier given by : V(x) = Vo(1-1/²), 0, -a≤x≤a otherwise M₁ V00) VoThe mean optical power launched into an optical fiber link is 1.5uw and the fiber has attenuation of 0.5 dB/km. Determine the maximum possible link length without repeaters when the minimum mean optical power level required at the detector is 2uw.After you calibrate the SpectroVis Plus spectrometer, you must a. run a full spectrum by selecting Sensors/Calibrate/Full Spectrum. O b. change the mode by selecting Sensors/Time-Based. Oc. collect a full spectrum of the sample to determine the wavelength of maximum absorbance. O d. change the mode by selecting Sensors/Data Collection.