Location of dark fringes in a single slit is given by
Where d is the slit width, m and m is the order.
The central maxima lies between two dark fringes with the order m = 1.
For small angles measured in radians, sinθ ≃ tan θ ≃ θ
A 0.52 mm-diameter hole is illuminated by light of wavelength 510 nm. What is the width of the central maximum on a screen 2.2 m behind the slit?
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