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In a Young's double slit experiment, d=0.5 mm andD = 100 cm. It is found that 9^(th) bright fringe is at a distance of 7.5 mm from the second dark fringe of fringe pattern. The wavelength of light used is (in Å) |
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Answer» `2500/7` where n=0,1,2,3,… For dark fringes , `x=((2n-1)lambdaD)/(2d)` where n=1,2,3,… As PER question `(9lambdaD)/d-(3lambdaD)/(2d)=7.5xx10^(-3)m` or `(15lambdaD)/(2d)=7.5xx10^(-3)` m `LAMBDA=(2xx7.5xx10^(-3) m xxd)/(15D)` Substituting the given values , we GET `lambda=(2xx7.5xx10^(-3) m xx 0.5xx10^(-3) m )/(15xx1 m)` = 5000 Å |
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