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A parallel beam of light of wavelength 6...

A parallel beam of light of wavelength 600 nm is incident normally on a slit of width d. If the distance between the slits and the screen is 0.8 m and the distance of `2^(nd)` order maximum from the centre of the screen is 15 mm. The width of the slit is

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Difference between interference and diffraction : Interference is due to superposition of two distinct waves coming from two coherent sources and diffraction is produced as a result of superposition of the secondary wavelets coming from different parts of the same wavefront.
Given : `lambda = 600 nm = 6xx10^(-7)m, D=0.8 m, y_(2)=15xx10^(-3)m`
To calculation :` y_(2)=(5)/(2)xx (lambda D)/(d)`
`rArr d= (5)/(2) xx (6xx10^(-7)xx0.8)/(15xx10^(-3)) :. ` Distance, `d=8xx10^(-5)=80 mu m`.
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