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In Young's double slit experiment, fringes of width beta are produced on a screen kept at a distance of 1 m from the slit. When the screen is moved away by 5 xx 10^(-2)m, fringe width changes by 3 xx 10^(-5) m. The separation between the slits is1 xx 10^(-5) m. The wavelength of the light used is : |
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Answer» 400 nm Wavelength `lambda = (Deltabetad)/(DELTAD) = (3 XX 10^(-5) xx 1 xx 10^(-3))/(5 xx 10^(-2))` ` = 6 xx 10^(-7) m` or `lambda = 600 nm` |
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