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In Young's double slit experiment, the fringe width is given by $\beta = \frac{\lambda D}{d}$. If the distance between the slits $d$ is doubled, what happens to the fringe width?
- A.It becomes double
- B.It becomes half
- C.It remains the same
- D.It becomes four times
Show correct answer & step-by-step solution
Correct answer: B — It becomes half
Solution
The fringe width is inversely proportional to the slit separation . Therefore, if is doubled, the fringe width is halved.
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