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 rthe current in the forward bias is more than the current in the reverse bias for `|V_z| gt ± 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 option given below

Options

A. A is true but R is false
B. A is false but R is true
C. Both A and R are true but R is NOT the correct explanation A
D. Both A and R are true and R is correct explanation A

Answer

To analyze the given statements, we need to evaluate both the Assertion (A) and the Reason (R) separately.

### Step 1: Evaluate Assertion A
Assertion A states: "Photodiodes are used in forward bias usually for measuring the light intensity."

- Photodiodes are semiconductor devices that convert light into electrical current. They are primarily used in reverse bias mode to measure light intensity. In reverse bias, the photodiode operates in a mode where it can detect light effectively, as it generates a photocurrent proportional to the intensity of the light falling on it.
- Therefore, this statement is **false**.

### Step 2: Evaluate Reason R
Reason R states: "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 |Vz| > |V0|."

- In a p-n junction diode, when in forward bias, the current increases significantly as the applied voltage exceeds the threshold voltage (V0). In reverse bias, the current is very small (reverse saturation current) until breakdown occurs.
- The statement correctly describes that for a p-n junction diode, the forward current is indeed greater than the reverse current when the applied voltage exceeds the threshold voltage and is within the breakdown region.
- Therefore, this statement is **true**.

### Step 3: Conclusion
- Assertion A is false, and Reason R is true. Since the reason does not explain the assertion, we conclude that the correct answer is that Assertion A is false, and Reason R is true.

### Final Answer
The correct answer is: **Assertion A is false, and Reason R is true.**