1.

In Young's experiment with sodium light the slits are 0.586 m aprt. Whatis the angular width of the fourth maximum ? Given that lambda = 589 nm :

Answer»

`sin^(-1)(3 xx 10^(-6)`
`sin^(-1)(3 xx 10^(-8))`
`sin^(-1)(0.33 xx 10^(-6))`
`sin^(-1)(0.33 xx 10^(-8))`

Solution :`x_(N) = (n lambda D)/(d)`
`or (x_(n))/(D) = (n lambda)/(d)`
`therefore sin theta = (n lambda)/(d) = 3 xx 10^(-6)`
`theta = sin^(-1) (3 xx 10^(-6))`.


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