InterviewSolution
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InterviewSolution
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In a double-slit experiment, two parallel slits are illuminated first bylight of wavelength 400 nm and then by light of unknown wavelength. The fourth-order dark fringe resulting from the known wavelength of light falls in the same place on the screen as the second-order bright fringe from the unknown wavelength. The value of unknown wavelength of light isA. 900 nmB. 700 nmC. 300 nmD. none of these |
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Answer» Correct Answer - b `y_(n) = (n + (1)/(2)) (D lambda)/(d) , n = 1, 2, 3` `(3 + (1)/(2)) (D lambda_(1))/(d) = 2 xx (D lambda_(2))/(d)` `lambda_(2) = (7)/(4) xx 400 = 700` nm |
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