Assertion : Colours can be seen in thin layers of oil on the surface of water.
Reason : White light is composed of several colours.

Options

A. STATEMENT-1 is True, STATEMENTS is True, STATEMENTS is a- correct explanation for ST A TEMENT-1
B. STATEMENT-1 is True. STATEMENTS is True, STATEMENTS is NO T a correct explanation for STATEMENT-1
C. STATEMENT-1 is True, STATEMENTS is False
D. STATEMENT-1 is False, STATEMENTS is True

Answer

To solve the question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Colours can be seen in thin layers of oil on the surface of water." This phenomenon is observed when light reflects off the thin film of oil, creating a colorful display due to interference.

2. **Understanding the Reason**:
- The reason states that "White light is composed of several colours." This is true; white light consists of a spectrum of colors (red, orange, yellow, green, blue, indigo, violet).

3. **Explaining the Assertion**:
- The colors seen in the thin layer of oil occur due to the phenomenon of interference. When light hits the oil film, some of it reflects off the top surface, and some penetrates the oil and reflects off the bottom surface. The light waves reflecting from these two surfaces can interfere with each other, leading to constructive or destructive interference depending on the wavelength (color) of the light. This results in the appearance of different colors.

4. **Evaluating the Relationship**:
- While both statements are true, the reason does not directly explain the assertion. The assertion is about the visual phenomenon observed, while the reason describes the composition of white light. The presence of colors in the oil film is due to interference, which is not explicitly explained by the fact that white light is made up of several colors.

5. **Conclusion**:
- Therefore, the correct evaluation is that both statements are true, but the reason is not a correct explanation for the assertion.

### Final Answer:
- Statement 1 is true, Statement 2 is true, but Statement 2 is not a correct explanation for Statement 1.