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  4. Width of slit in a single slit diffraction experiment such that 20 maxima of double slit interference pattern are obtained within central maxima of the diffraction pattem is (Slit separation for double slit arrangement = 2 mm )

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Q. Width of slit in a single slit diffraction experiment such that $20$ maxima of double slit interference pattern are obtained within central maxima of the diffraction pattem is (Slit separation for double slit arrangement = $2\, mm$ )

Wave Optics

Solution:

$20 \frac{D \lambda}{d}=\frac{2 D \lambda}{b}, $
$d=2 \,mm$