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State one feature by which the phenomenon of interference can be distinguished from that of the diffraction. A parallel beam of light of wavelength 600 nm is incident normally on a slit of width 'a'. If the distance between the slit and the screen is 0.8m and the distance of second order maximum from the centre of the screen 15 mm, calculate the width of the slit. |
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Answer» Solution :For DISTINGUISHING FEATURE between interference and diffraction. Here `lamda=600nm=600xx10^(-9)m`, distance of screen from the slit D=0.8m, distance of 2nd order diffraction minimum from centre of screen x=15mm`=15xx10^(-3)m` `a=(nlamda)/(sintheta)=(nlamda*D)/(x)=(2xx600xx10^(-9)xx0.8)/(15xx10^(-3))=6.4xx10^(-5)m`. |
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