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The figure shows a spot of light of uniform intensity 50 W/m2 and size 10 mm × 10 mm incident at the exact center of a photo-detector, comprising two identical photo-diodes D1 and D2. Each diode has a sensitivity of 0.4 A/W and is operated in the photoconductive mode. If the spot of light is displaced upwards by 100 μm, the resulting difference between the photocurrents generated by D1 and D2 in micro amperes, is __________ μA.
Correct answer is '40'. Can you explain this answer?
Most Upvoted Answer
The figure shows a spot of light of uniform intensity 50 W/m2 and size...
Photocurrent = Sensitivity × intensity × Area
After displacing by 100 μm

Current form the upper part:

IL = 80 μA
Difference = (120 – 80) μA
= 40 μA
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The figure shows a spot of light of uniform intensity 50 W/m2 and size 10 mm × 10 mm incident at the exact center of a photo-detector, comprising two identical photo-diodes D1 and D2. Each diode has a sensitivity of 0.4 A/W and is operated in the photoconductive mode. If the spot of light is displaced upwards by 100 μm, the resulting difference between the photocurrents generated by D1 and D2 in micro amperes, is __________ μA.Correct answer is '40'. Can you explain this answer?
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