Question: For a certain laser device, the laser output power P (in mW) is negligible if the drive current i is less than 80 mA. From

For a certain laser device, the laser output power P (in mW) is negligible if the drive current i is less than 80 mA. From 80 mA to 140 mA, P = 1.5 × 10−6i3 − 0.77. Plot the graph of P = f(i).

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