Experimental observation in a single slit experiment shows that the intensity has a central maximum at θ = 0 and minima at θ = ______________.(where θ is the angle between the central line and the line joining the midpoint of the slit of width 'a' to any point P on the screen, λ is the wavelength of the lightand n = ±1, ±2, ±3, ....)

• A. nλ/a
• B. (n+1/2) λ/a
• C. na/λ
• D. (n+1/2)a/λ