A phototransistor has collector current of 18 mA, incident optical pow – McqOptions

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1.	A phototransistor has collector current of 18 mA, incident optical power of 128 ‚âà√≠¬¨‚à´W with a wavelength of 1.24 ‚âà√≠¬¨‚à´m. Determine an optical gain.$
A.	1.407 *10<sup>2</sup>
B.	19.407 *10<sup>2</sup>
C.	2.407 *10<sup>2</sup>
D.	3.407 *10<sup>2</sup>
Answer» B. 19.407 *10<sup>2</sup>

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