(A) : Optical communication is preferred to microwave communication
(R) : Microwaves provide large number of channels and bandwidth as compared to optical signals.

Options

A. Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'.
B. Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'.
C. A' is true abd 'R' false
D. A' is false and 'R' is false

Answer

To analyze the given statements regarding optical communication and microwave communication, we will break down the question into two parts: the assertion (A) and the reason (R).

### Step-by-Step Solution:

1. **Understanding Assertion (A)**:
- The assertion states that "Optical communication is preferred to microwave communication."
- Optical communication uses light waves to transmit information and is known for its high data rates and large bandwidth capabilities.

2. **Understanding Reason (R)**:
- The reason states that "Microwaves provide a large number of channels and bandwidth as compared to optical signals."
- Microwaves are electromagnetic waves with frequencies ranging from 1 GHz to 300 GHz and can carry information over long distances.

3. **Evaluating the Assertion**:
- Optical communication is indeed preferred in many applications due to its advantages, such as higher bandwidth, lower attenuation, and immunity to electromagnetic interference.
- Therefore, the assertion (A) is **true**.

4. **Evaluating the Reason**:
- The statement that "Microwaves provide a large number of channels and bandwidth as compared to optical signals" is misleading.
- Optical signals can support a much larger bandwidth than microwave signals, allowing for more channels and higher data transmission rates.
- Therefore, the reason (R) is **false**.

5. **Conclusion**:
- Since the assertion (A) is true and the reason (R) is false, the correct relationship is that the assertion is true but the reason is not a valid explanation for the assertion.

### Final Answer:
Both the assertion (A) is true, and the reason (R) is false. Thus, the correct answer is that the assertion is true, and the reason is false.

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