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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 –

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The fraunhofer diffraction pattern of a single slit is formed at the focal plane of a lens of focal length 1m. The width of the slit is 0.3 mm. if the third minimum is formed at a distance of 5 mm from the central maximum then calculate the wavelength of light.

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