Assertion (A): The light of violet colour deviates the most and the light of red colour the least, while passing through a prim.
Reason (R):The refractive index in highest for red light and lowest for the violet light.

Options

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

Explanation

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

### Step-by-Step Solution:

1. **Understanding the Assertion (A)**:
- The assertion states that "The light of violet color deviates the most and the light of red color the least while passing through a prism."
- This is true because violet light has a shorter wavelength and a higher frequency compared to red light. When light passes through a prism, different colors (wavelengths) of light are refracted by different amounts. Violet light, being at the end of the visible spectrum, bends more than red light.

2. **Understanding the Reason (R)**:
- The reason states that "The refractive index is highest for red light and lowest for violet light."
- This statement is incorrect. In fact, the refractive index is highest for violet light and lowest for red light. The refractive index of a medium is inversely related to the wavelength of light. Since violet light has a shorter wavelength, it has a higher refractive index in a prism compared to red light.

3. **Conclusion**:
- Since the assertion is true and the reason is false, we can conclude that the assertion is correct, but the reason provided does not support the assertion.

### Final Answer:
- The assertion (A) is true, but the reason (R) is false.