Fraunhofer diffraction pattern of a single slit is obtained in the focal plane of the lens of focal length 1 m . The third minimum is formed at a distance of 5 mm from the central maximum and the wave

Question

Fraunhofer diffraction pattern of a single slit is obtained in the focal plane of the lens of focal length 1 m . The third minimum is formed at a distance of 5 mm from the central maximum and the wavelength of light used in the experiment is 5000 Å . From the given data find the width (in mm ) of the slit used in the experiment.

TestHub · Accepted Answer

Using a sin ⁡ θ = n λ Or a . x f = 3 λ or a = 3 λ . f x = 3 × 5000 × 10 - 10 × 1 5 × 10 - 3 = 3 × 10 - 4 m

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