A : Transverse wave nature of light is proved by polarisation.
R : According to Maxwell, light is an electromagnetic wave but not mechanical wave.

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 and R is false
D. Both A and R are false

Answer

To analyze the statements given in the question, we will break down the assertion (A) and the reason (R) and evaluate their validity and relationship.

### Step 1: Understand the Assertion (A)
The assertion states that "Transverse wave nature of light is proved by polarisation."

- **Explanation**: Polarization is a phenomenon that occurs only in transverse waves. In a transverse wave, the oscillations are perpendicular to the direction of wave propagation. Light can be polarized, which indicates that it behaves as a transverse wave. Therefore, the assertion is true.

### Step 2: Understand the Reason (R)
The reason states that "According to Maxwell, light is an electromagnetic wave but not a mechanical wave."

- **Explanation**: James Clerk Maxwell's theory of electromagnetism describes light as an electromagnetic wave, which consists of oscillating electric and magnetic fields. Unlike mechanical waves, which require a medium to propagate, electromagnetic waves can travel through a vacuum. This statement is also true.

### Step 3: Evaluate the Relationship Between A and R
Now we need to determine if the reason (R) correctly explains the assertion (A).

- **Analysis**: While both statements are true, the reason does not provide a direct explanation for the assertion. The assertion about the transverse nature of light being proven by polarization is based on the characteristics of transverse waves, while the reason discusses the classification of light as an electromagnetic wave. Thus, the reason does not explain why the transverse nature of light is proven by polarization.

### Conclusion
- Assertion (A) is true.
- Reason (R) is true.
- However, R is not a correct explanation of A.

Therefore, the correct answer is that both A and R are true, but R is not the correct explanation of A.

### Final Answer:
- A: True
- R: True
- Explanation: R is not the correct explanation of A.

---