Which expression gives the angular positions of the minima in the Fraunhofer…

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

Which expression gives the angular positions of the minima in the Fraunhofer diffraction pattern produced by a single slit of width

a

illuminated by light of wavelength

\lambda

? (a)

a\cos\theta = m\lambda

(b)

a\sin\theta = \dfrac{m\lambda}{2}

(c)

a\sin\theta = m\lambda

(d)

a\sin\theta = (m+\tfrac12)\lambda