Assertion (A) : Young's double slit experiment can be performed using a source of white light.
Reason (R ) : The wavelength of red light is less than wavelength of other colors in white light.

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. A' is false and 'R' is true

Answer

To solve the question regarding the assertion and reason related to Young's double slit experiment, we will analyze both statements step by step.

### Step-by-Step Solution:

1. **Understanding the Assertion (A)**:
- The assertion states that "Young's double slit experiment can be performed using a source of white light."
- Young's double slit experiment is a demonstration of the wave nature of light through interference patterns created by coherent light sources.

2. **Analyzing the Condition for Young's Experiment**:
- For Young's double slit experiment to yield clear interference patterns, the light source must be coherent and monochromatic.
- Coherent means that the light waves maintain a constant phase relationship, and monochromatic means that the light consists of a single wavelength.

3. **Understanding White Light**:
- White light is a mixture of multiple wavelengths (colors), typically represented by the acronym VIBGYOR (Violet, Indigo, Blue, Green, Yellow, Orange, Red).
- Since white light contains multiple wavelengths, it does not satisfy the monochromatic condition.

4. **Conclusion on the Assertion**:
- Although it is possible to observe interference patterns with white light, the patterns will not be clear and distinct due to the presence of multiple wavelengths.
- Therefore, the assertion that Young's double slit experiment can be performed using a source of white light is **true**, but the clarity of the interference pattern will be compromised.

5. **Understanding the Reason (R)**:
- The reason states that "The wavelength of red light is less than the wavelength of other colors in white light."
- This statement is incorrect. In the visible spectrum, red light has the longest wavelength compared to other colors (Violet has the shortest wavelength).

6. **Conclusion on the Reason**:
- Since the reason provided is false, we conclude that the reason does not support the assertion.

### Final Conclusion:
- The assertion (A) is **true** while the reason (R) is **false**. Therefore, the correct answer is that the assertion is true and the reason is false.