In Fraunhofer diffraction by a slit

PHYSICS · Single correct · CBSE · Physics · Wave Optics · Wave Optics

Problem

In Fraunhofer diffraction by a slit, if slit width is

a

, wavelength is

\lambda

, and focal length of the lens is

f

, the linear width of the central maximum is: (a)

\frac{f\lambda}{a}

(b)

\frac{fa}{\lambda}

(c)

\frac{2f\lambda}{a}

(d)

\frac{f\lambda}{2a}