Question

A beam of microwaves whose wavelength is 0.052 m is coming towards a rectangular aperture of width 0.35 m. Resultant diffraction pattern is observing on a wall at 8.0 m distance from aperture. The distance between first and second order outer fringes will be:
(a) 1.3 m
(b) 1.8 m
(c) 1.19 m
(d) 2.5 m

Answer 1

(c) 1.19 m
λ = 0.052 m, α = 0.36 m, D = 80 m
If first maxima is at distance X, from central maxima, then