AP EAMCET · PHYSICS · Wave Optics
In Young's double slit experiment, if the distance between the slits is increased to 3 times initial distance, then the ratio of initial and final fringe widths is
- A \(1: 9\)
- B \(9 :1\)
- C \(3: 1\)
- D \(1 :3\)
Answer & Solution
Correct Answer
(C) \(3: 1\)
Step-by-step Solution
Detailed explanation
\( \beta = \frac{\lambda D}{d} \) \( \beta_1 = \frac{\lambda D}{d} \) \( \beta_2 = \frac{\lambda D}{3d} \) \( \frac{\beta_1}{\beta_2} = \frac{\lambda D / d}{\lambda D / (3d)} = \frac{3d}{d} = 3:1 \)
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