Question

I - V characteristics of photodiode for different illumination intensities \( I_1, I_2, I_3, I_4 \) are drawn as follows. Then the maximum intensity among them is

• A. \( I_1 \)
• B. \( I_2 \)
• C. \( I_3 \)
• D. \( I_4 \)

Hint:

Photodiodes are always operated in reverse bias mode to detect light intensity.

Answer 1

The Correct Option is D

Step 1: Concept
In a photodiode, the reverse saturation current is directly proportional to the intensity of incident light.
Step 2: Graph Analysis
The graph shows four curves in the third quadrant. $I_4$ has the highest magnitude of reverse current.
Step 3: Comparison
Higher reverse current $\Rightarrow$ Higher photon flux $\Rightarrow$ Higher Intensity.
Step 4: Conclusion
Therefore, $I_4$ is the maximum intensity.
Final Answer:(D)