1.

What will be angle of first order maxima obtained by Fraunhoffer diffraction by single slit of width0.50 mm ,using light of wavelength 500 nm

Answer»

`1.5XX10^(-4)` radian
`1.5xx10^(-3)` radian
`1xx10^(-3)` radian
`3xx10^(-3)` radian

Solution :Condition for `m^(th)` order maximum
`d sin theta_(m)=(2m+1)(lambda)/(2)`
Taking `m=1`
`sin theta_(1)=(3lambda)/(2d)`
`=(3xx5xx10^(-7))/(5xx10^(-4))=3xx10^(-3)` RAD
if `theeta_(1)` is too small `sin theta_(1)~~ theta_(1)`
`theta_(1)=3xx10^(-3)` radian


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