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) $2\dfrac{D\lambda}{a}$
Concept. Single slit minima at $y_n=\dfrac{n\lambda D}{a}$.
Step 1. Separation. $y_3-y_1=\dfrac{2\lambda D}{a}$.
Answer. Option C.
Solution by Sreeraj P, M.Sc Physics
