In the far-field diffraction pattern of a single slit under polychromatic illumination, the first minima with the wavelength λ1 is found to be coincident with the third minima at λ2 than the relationship between these two wavelengths is:
(a) 3λ1 = 0.3λ2
(b) 3λ1 = λ2
(c) λ1 = 3λ2
(d) 0.3λ1 = 3λ2
