In Young's experiement, the distance between slits is `0.28mm` and distance between slits and screen is `1.4m`. Distance between central bright fringe and third bright fringe is `0.9cm`. What is the wavelength of used light?
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Here, `d = 0.28 mm = 0.28 xx 10^(-3)m, D = 1.4 m, x = 1.2 cm = 1.2 xx 10^(-2)m, n = 4, lambda = ?` For constructive interference `x = n lambda = (D)/(d) or lambda = (x d)/(nD) = (1.2 xx 10^(-2) xx 0.28 xx 10^(-3))/(4 xx 1.4) = 6 xx 10^(-7)m`
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