Assertion (A): Photodiodes are used in forward bias usually for measuring the light intensity. [2023]

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Solution

Q.
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R) [2023]

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 $| V_{z} |$ $> \pm V \geq$ $| V_{0} |$ 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:

1 A is true but R is false

2 A is false but R is true

3 Both A and R are true but R is not the correct explanation of A

4 Both A and R are true and R is correct explanation of A

Ans.
(2)

Photodiodes are usually used in forward Bias.

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