In a Young's double slit interference experiment

Question:

In a Young's double slit interference experiment the fringe pattern is observed on a screen placed at a distance $D$ from the slits. The slits are separated by a distance $d$ and are illuminated by monochromatic light of wavelength $\lambda$. Find the distance from the central point where the intensity falls to

(a) half the maximum,

(b) one fourth of the maximum.

Solution:

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