Assertion: Dispersion of light occurs because velocity of light in a material depends upon its colour
Reason: If we shine the primary colours red, blue, and green together, we will get white De formed if light.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

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 "Dispersion of light occurs because the velocity of light in a material depends upon its color."
- **Explanation**: This is true. Dispersion occurs when light passes through a medium (like a prism) and different colors (wavelengths) of light travel at different speeds. As a result, they bend at different angles when entering or exiting the medium, leading to the separation of light into its constituent colors.

2. **Understanding the Reason**: The reason states that "If we shine the primary colors red, blue, and green together, we will get white light."
- **Explanation**: This statement is misleading. While red, blue, and green are primary colors of light, they do not necessarily produce white light when combined. To achieve white light, all three primary colors (red, green, and blue) must be combined in the correct proportions. However, if only red, blue, and green are mentioned without specifying the need for proper mixing, the statement can be considered false.

3. **Conclusion**:
- The assertion is true because it accurately describes the phenomenon of dispersion.
- The reason is false because it does not correctly explain how white light is formed from primary colors.

4. **Final Answer**: Since the assertion is true and the reason is false, the correct option is that the assertion is true and the reason is false.