Question

In a Young's double slit experiment, the intensity at the central maximum is $l_0$ The intensity at a distance $\frac{\beta }{2}$ above the central maximum is ( where $\beta$ = fringe width)

Answer 1

$\beta$ is the fringe width, i.e., distance between two consecutive dark

or bright fringers.

In YDSE, dark and bright fringes form alternatively, at distance = $\beta /2$

between them.

$\therefore$ A dark fringe forces at distance $\beta /2$ from central maximum

$\Rightarrow$ Intensity = 0