Explain, with the help of a circuit diagram, the working of a photo diaode. Write briefly how it is used to detect the optical signals.

Explanation

### Step-by-Step Solution:

**Step 1: Understanding the Photodiode Structure**
- A photodiode is a semiconductor device that converts light into an electrical current. It is typically made from a p-n junction. The p-n junction is formed by doping one side of the semiconductor with p-type material (which has holes as majority carriers) and the other side with n-type material (which has electrons as majority carriers).

**Step 2: Circuit Diagram**
- Draw a circuit diagram of a photodiode in reverse bias configuration. The diagram should include:
- A p-n junction diode symbol.
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