Condition for maximum:

$\overline{){\mathbf{d}}{\mathbf{}}{\mathbf{s}}{\mathbf{i}}{\mathbf{n}}{\mathbf{}}{\mathbf{\theta}}{\mathbf{=}}{\mathbf{m}}{\mathbf{\lambda}}}$

For maximum, m = 1

y = Lλ/d

1 μm = 1000 nm

1 m = 1000000 μm

Four trials of Young's double-slit experiment are conducted.

(a) In the first trial, blue light passes through two fine slits400 μm apart and forms an interference pattern on a screen 4 m away.

(b) In a second trial, red light passes through the same slits and falls on the same screen.

(c) A third trial is performed with red light and the same screen, but with slits 800 μmapart.

(d) A final trial is performed with red light, slits 800μm apart, and a screen 8 m away.

Rank the trials according to the distance between the central maximum and the first-order side maximum on the screen.

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