qno.28
Q.28. In a Young's double slit experiment sources of equal intensities are used. Distance between slits is d and wavelength of light used is $\lambda$ ($\lambda$ << d). Angular separation of nearest points on either side of central maximum where intensities become half of the maximum value is
(1) $\frac{\lambda }{d}$
(2) $\frac{\lambda }{2d}$
(3) $\frac{\lambda }{4d}$
(4) $\frac{\lambda }{6d}$