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A single slit of width b is illuminated ...

A single slit of width b is illuminated by a coherent monochromatic light of wavelength `lambda`. If the second and fourth minima in the diffraction pattern at a distance 1 m from the slit are at 3 cm and 6 cm respectively from the central maximum, what is the width of the central maximum ? (i.e., distance between first minimum on either side of the central maximum)

A

4.5 cm

B

1.5 cm

C

6.0 cm

D

3.0 cm

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D
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