Physics

Problem

In a double slit experiment shown in figure, when light of wavelength

400 \text{ nm}

is used, dark fringe is observed at

P

. If

D = 0.2 \text{ m}

, the minimum distance between the slits

S_1

and

S_2

\alpha \text{ mm}

. Write the value of

10\alpha

to the nearest integer. ![Diagram of a double slit experiment setup. A source emits light towards two slits, S1 and S2, separated by distance d. The slits are located at a height D above the source. The distance from the slits to the observation point P is also D. The path difference between S1 and S2 to P is shown.](https://storage.googleapis.com/diraq-contents/homework-question-parsing/marker/20260106T182719Z/6ca60ea165b14d39af8d3e65aa053617/5fb340ad68b0c71df0b56698b137e35b_img.jpg)

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