The main difference in the phenomenon of interference and diffraction is that

Options

A. diffraction is due to interaction of light from the same wavefront whereas interference is the interaction of waves from wave isolated sources
B. diffraction is due to interaction of light from the same wavefront whereas interference is the interaction of two waves derived from the same source
C. diffraction is due to interaction of waves derived from the same source, whereas the interference is the bending of light from the same wavefront
D. diffraction is caused by reflected waves from a source whereas interference caused is due to refraction of waves from a surface

Answer

To solve the question regarding the main difference between the phenomena of interference and diffraction, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Interference**:
- Interference occurs when two or more coherent light waves from different sources overlap and combine to form a new wave pattern. This phenomenon is characterized by the formation of bright and dark fringes due to constructive and destructive interference.

2. **Understanding Diffraction**:
- Diffraction, on the other hand, occurs when a single wavefront encounters an obstacle or a slit that is comparable in size to its wavelength. This causes the wave to bend around the edges of the obstacle or slit, leading to the spreading out of the wavefront.

3. **Identifying the Key Difference**:
- The main difference lies in the sources of the waves involved:
- **Interference** involves two or more separate wavefronts originating from different sources.
- **Diffraction** involves the bending and spreading of waves from a single wavefront due to an obstacle or aperture.

4. **Choosing the Correct Option**:
- Given the options, the correct statement is that diffraction is due to the interaction of light from the same wavefront, whereas interference involves waves from different isolated sources.

5. **Conclusion**:
- Therefore, the correct answer to the question is that the main difference in the phenomenon of interference and diffraction is that interference involves multiple sources, while diffraction involves a single source.

### Final Answer:
The main difference in the phenomenon of interference and diffraction is that interference is caused by the interaction of waves from different sources, while diffraction is caused by the bending of waves from the same wavefront.