For a parallel beam of monochromatic light of wavelength `'lambda'` diffraction is produced by a single slit whose width `'a'` is of the order of the wavelength of the light. If `'D'` is the distance of the screen from the slit, the width of the central maxima will be

Options

A. `(Da)/(lambda)`
B. `(2Da)/(lambda)`
C. `(2 Dlambda)/(a)`
D. `(D lambda)/(a)`

Answer

C

Explanation

Central maxima ` = 2 xx beta`