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NEET 2015
Exam
NEET
Year
2015
Subject
Physics
Chapter
Wave Optics

NEET 2015 · Physics · Wave Optics

For a parallel beam of monochromatic light of wavelength& λ ,...

For a parallel beam of monochromatic light of wavelength& λ\lambda, diffraction is produced by a single slit whose width a\text{a} is of the order of the wavelength of the light. If D\text{D} is the distance of the screen from the slit, the width of the central maxima will be:For a parallel beam of monochromatic light of wavelength& λ , diffraction is produced by a single slit whose width a is

Options

  1. A2Dλa\dfrac{2D\lambda}{a}
  2. BDλa\dfrac{D\lambda}{a}
  3. CDaλ\dfrac{Da}{\lambda}
  4. D2Daλ\dfrac{2Da}{\lambda}

Correct answer

A. 2Dλa\dfrac{2D\lambda}{a}

Step-by-step solution

Linear width of central maximum.

D(2θ)=2Dθ=2DλaD\left(2\theta\right) = 2D\theta = \dfrac{2D\lambda}{a}

For a parallel beam of monochromatic light of wavelength& λ , diffraction is produced by a single slit whose width a is
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