Consider two coherent point sources \( S_1 \) and \( S_2 \) separated by a small distance along a vertical line and two screens \( P_1 \) and \( P_2 \) placed as shown in the figure. Which one of the choices represents the shapes of the interference fringes at the central regions on the screens?
Consider two coherent point sources \( S_1 \) and \( S_2 \) separated by a small distance along a vertical line and two screens \( P_1 \) and \( P_2 \) placed as shown in the figure. Which one of the choices represents the shapes of the interference fringes at the central regions on the screens?
Show Hint
- Circular on \( P_1 \) and straight lines on \( P_2 \).
- Circular on \( P_1 \) and circular on \( P_2 \).
- Straight lines on \( P_1 \) and straight lines on \( P_2 \).
- Straight lines on \( P_1 \) and circular on \( P_2 \).
The Correct Option is A
Solution and Explanation
When two coherent point sources are placed in close proximity, the interference pattern observed on the screen depends on the geometry of the setup. The interference fringes on the screen \( P_1 \) will be circular due to the circular symmetry of the sources, while the pattern on \( P_2 \) will form straight lines due to the linear arrangement of the sources.
Step 2: Conclusion.
Thus, the correct answer is option (A).
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