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A planar GaAsLED exhibits an external power efficiency of 2% when driven with a current of 40 mA. The voltage developed across its terminals is 2.

A planar GaAs LED exhibits an external power efficiency of 2% when driven with a current of 40 mA. The voltage developed across its terminals is 2.2 V. Estimate the optical power generated within the device assuming transmission into air.

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