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In a double slit experiment, two parallel slits are illuminated first by light of wavelength 400 nm and then by light of unknown wavelength. The fourth order dark fringe resulting 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. 900nmB. 700nmC. 300nmD. none of these |
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Answer» Correct Answer - B `Yn=(n+(1)/(2))(Dlamda)/(d)n=1,2,3` `(3+(1)/(2))(Dlamda_(1))/(d)=2xx(Dlamda_(2))/(d)` `lamda_(2)=(7)/(4)lamda_(1)=(7)/(4)xx400=700nm` |
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