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.

Options

A. `0.125`
B. `0.15`
C. `0.015`
D. `0.0125`

Answer

D

Explanation

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