1.

In Fraunhoffer diffraction by a single slit, the width of the slit is 0.01 cm. If the wavelength of the light incident normally on the slit is 5000 Å the angular distance of second maxima from the mid line of central maxima is ...... rad.

Answer»

`0.125`
`0.15`
`0.015`
`0.0125`

SOLUTION :for `n^(TH)` ORDER MAXIMUM,
`d sin theta=(2n+1)(lambda)/(2)`
`=(5lambda)/(2d)"" [ :. n=2`
`=(5xx5xx10^(-5))/(2xx0.01)`
`=(25)/(2)xx10^(-3)=0.0125` RAD


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