In YDSE,the separation between the slits is h | vedclass

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(D) The formula for fringe width in $YDSE$ is given by $\beta = \frac{\lambda D}{d}$,where $\lambda$ is the wavelength of light,$D$ is the distance be

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four times

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(D) The formula for fringe width in $YDSE$ is given by $\beta = \frac{\lambda D}{d}$,where $\lambda$ is the wavelength of light,$D$ is the distance between the slit and the screen,and $d$ is the separation between the slits.Given that the new separation $d' = \frac{d}{2}$ and the new distance $D' = 2D$.The new fringe width $\beta'$ will be $\beta' = \frac{\lambda D'}{d'} = \frac{\lambda (2D)}{(d/2)} = 4 	imes \frac{\lambda D}{d} = 4\beta$.Therefore,the fringe width becomes four times the original value.

In $YDSE$,the separation between the slits is halved and the distance between the slit and the screen is doubled. The fringe width is

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