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For a parallel beam of monochromatic light of wavelength 'λ‘, 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 :
  • a)
    2Da/λ
  • b)
    2Dλ/a
  • c)
    Dλ/a
  • d)
    Da/λ
Correct answer is option 'B'. Can you explain this answer?
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For a parallel beam of monochromatic light of wavelength λ, diffraction is produced by a single slit whose width 'a' is of the order of the wavelength we have
where θ is the angle subtended by the first minima and the central maxima at the slit.
If x is the width of the central maxima, we have
where D is the distance of the screen from the slit
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For a parallel beam of monochromatic light of wavelength λ‘, diffraction is produced by a single slitwhose width a‘ is of the order of the wavelength of the light. If D‘ is the distance of the screen fromthe slit, the width of the central maxima will be :a)2Da/λb)2Dλ/ac)Dλ/ad)Da/λCorrect answer is option 'B'. Can you explain this answer?
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