A single slit of width \( d \) is illuminated by violet light of wavelength \( 4000 \AA \) and t...

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A single slit of width \( d \) is illuminated by violet light of wavelength \( 4000 \AA \) and the width of the central maxima is measured as \( y \). When half of the slit width is covered and illuminated by yellow light of wavelength \( 6000 \AA \), the width of the central maxima is
(a) The pattern vanishes
(b) \( y / 3 \)
(c) \( 3 y \)
(d) None of the above
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