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JEE Main 2026 (4 Apr, Shift 1) · Diffraction at a Single Slit

Diffraction at a Single Slit question from JEE Main 2026 (4 Apr, Shift 1)

Q6JEE Main 2026 · 4 APR · SHIFT 1Medium

Diffraction at a Single Slit

A slit of width $a$ is illuminated by light of wavelength $\lambda$ . The linear separation between $1$ st and $3$ rd minima in the diffraction pattern produced on a screen placed at a distance $D$ from the slit system is ______.

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Answer: (c)

Minima on the screen: $y_n = \dfrac{nD\lambda}{a}$ .
$y_3 - y_1 = \dfrac{3D\lambda}{a} - \dfrac{D\lambda}{a} = \dfrac{2D\lambda}{a}$
So the answer is (c) $2\dfrac{D\lambda}{a}$ .

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