Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
**Assertion A:** Photodiodes are used in forward bias usually for measuring the light intensity.
**Reason R:** For a $p$-$n$ junction diode, at applied voltage $V$ the current in the forward bias is more than the current in the reverse bias for $|V_z|>\pm V\ge|V_0|$ where $V_0$ is the threshold voltage and $V_z$ is the breakdown voltage.
In the light of the above statements, choose the correct answer from the options given below:
Answer: (C) A is false but R is true
Photodiodes are operated in reverse bias, where the photocurrent is a large fraction of the total current, so A is false. R is a correct statement about diode currents.
Solution by Sreeraj P, M.Sc Physics