Which of the following statements is correct

Options

A. diffraction is because of interference of light from same source where as interference is due to light from two individual sources
B. diffraction pattern is due to interference of light from secondary waves of the same wave front whereas interference is due to superposition of two waves derived from the same source
C. diffraction is due to interference of light waves derived from the same source whereas interference is bending of light at the obstacle
D. none of the above

Answer

To determine which statement is correct regarding diffraction and interference, let's analyze each option step by step.

### Step 1: Understanding Diffraction
Diffraction is the phenomenon where light waves bend around the edges of an obstacle or aperture. This bending occurs due to the wave nature of light.

### Step 2: Understanding Interference
Interference is the phenomenon that occurs when two or more light waves overlap and combine to form a new wave pattern. This typically happens when light comes from two coherent sources (like two slits from a single light source).

### Step 3: Analyzing Each Statement
1. **Statement 1:** "Diffraction is because of interference of light from some source whereas interference is due to light from two individual sources."
- **Analysis:** This statement is incorrect. Diffraction does not arise from interference; rather, it is a separate phenomenon that involves bending of waves. Interference indeed requires two sources, but they are usually derived from the same source.

2. **Statement 2:** "Diffraction pattern is due to interference of light from secondary waves of the same wave front whereas interference is due to superposition of two waves derived from the same source."
- **Analysis:** This statement is correct. In diffraction, the light waves emanate from the same wave front and create secondary wavelets that interfere with each other. In interference, the superposition occurs from two coherent sources derived from the same initial source.

3. **Statement 3:** "Diffraction is due to interference of light waves derived from the same source whereas interference is bending of light at the obstacle."
- **Analysis:** This statement is incorrect. Diffraction is not due to interference; it is the bending of light waves around obstacles. Interference does not involve bending but rather the superposition of waves.

### Conclusion
The correct statement is **Statement 2**: "Diffraction pattern is due to interference of light from secondary waves of the same wave front whereas interference is due to superposition of two waves derived from the same source."

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