Question

In Young's experiment, the distance between the slits is reduced to half and the distance between the slit and screen is doubled, then the fringe width.

• A. Will not change
• B. Will become half
• C. Will be doubled
• D. Will become four times

Answer 1

Answer: (D)

Will become four times

Answer 2

$\beta = \frac{\lambda D}{d} \Rightarrow$ If D becomes twice and d becomes half so $\beta$ becomes four times.