A plane wavefront of wavelength λ is incident on a single slit of width 'a'. The angular width of principal maxima is
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Explanation:
Location of bright Fringes is given by Xn = nλD/a
Where n = nth bright fringe
λ=wave length
D = distance between slit and screen
a is slit width
Fringe width is equal to separation between two consecutive bright or dark fringes
β= λD/a
Angular fringe width is angle subtended by fringe width at slits
Ө= β/D
Therefore Ө=λ/a
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