Q 12-10-036JEE MainJEE Main 2026 (4 Apr, Shift 1)Easy
A slit of width $a$ is illuminated by light of wavelength $\lambda$. The linear separation between $1^{\text{st}}$ and $3^{\text{rd}}$ minima in the diffraction pattern produced on a screen placed at a distance $D$ from the slit system is ______.
Answer: (C) $2\dfrac{D\lambda}{a}$
Minima are at $y_n = \dfrac{n\lambda D}{a}$. $y_3 - y_1 = \dfrac{2\lambda D}{a}$.
Solution by Sreeraj P, M.Sc Physics