Fraunhoffer diffraction pattern of a sin...

Fraunhoffer diffraction pattern of a single slit is obtained in the focal plane of lens of focal length `1m`. If third maximum is formed at a distance of 5mm from the central maximum and wavelength of light used is `5000Å`, then width of the slit will be –

`0.02 cm`

`0.03cm`

`0.04cm`

`1cm`

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