(A) : Repeaters are used to extend the range of communication
(R) : Repeater is combination of a receiver and a transmitter.

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 solve the problem, we need to analyze the assertion and the reason given in the question.

### Step 1: Understand the Assertion
The assertion states: "Repeaters are used to extend the range of communication."
- This means that repeaters play a crucial role in communication systems by amplifying or regenerating signals to cover larger distances.

### Step 2: Understand the Reason
The reason states: "Repeater is a combination of a receiver and a transmitter."
- This indicates that a repeater works by receiving a signal (using its receiver) and then retransmitting it (using its transmitter) to extend the communication range.

### Step 3: Analyze the Relationship
Now we need to determine if the reason provided correctly explains the assertion.
- Since a repeater indeed consists of both a receiver and a transmitter, it allows the signal to be picked up and then sent out again, which is essential for extending the range of communication.

### Step 4: Conclusion
Both the assertion and the reason are true, and the reason correctly explains why repeaters are used to extend the range of communication.

### Final Answer
Both the assertion (A) and reason (R) are true, and R is the correct explanation of A.