1.

In Young's double slit experiment the light emitted from source has lambda = 6.5 xx 10^(-7) m and the distance between the two slits is 1 mm. Distance between the screen and slit is 1 metre. Distance between the screen and slit is 1 metre. Distance between third dark and fifth bright fringes will be :

Answer»

`3.2` mm
`1.63` mm
`0.585` mm
`2.31` mm

Solution :`x_(5) = (n LAMBDA D)/(d) = 32.5 xx 10^(-4) m`
`x_(3) = (2n - 1) (lambda)/(2) (D)/(d) = 16.25 xx 10^(-4) m`
`x_(5) - x_(3) = 1.63 mm`.


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