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NEET 2015 (AIPMT, Cancelled Paper) · Diffraction at a Single Slit

Diffraction at a Single Slit question from NEET 2015 (AIPMT, Cancelled Paper)

Q79NEET 2015 · AIPMT · CANCELLED PAPEREasy

Diffraction at a Single Slit

For a parallel beam of monochromatic light of wavelength ' $\lambda$ ', diffraction is produced by a single slit whose width 'a' is of the order of the wavelength of the light. If 'D' is the distance of the screen from the slit, the width of the central maxima will be

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Answer: (c)

First minima lie at $\theta = \pm\dfrac{\lambda}{a}$ , at distance $\dfrac{D\lambda}{a}$ from the centre on the screen.
Width of central maximum $= 2 \times \dfrac{D\lambda}{a}$ .
So the answer is (c) $\dfrac{2D\lambda}{a}$ .

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