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(A) The fringe width $\beta$ in a Young's double slit experiment is given by the formula $\beta = \frac{\lambda D}{d}$,where $\lambda$ is the waveleng

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consecutive fringe lines will come closer.

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(A) The fringe width $\beta$ in a Young's double slit experiment is given by the formula $\beta = \frac{\lambda D}{d}$,where $\lambda$ is the wavelength of light,$D$ is the distance between the screen and the slits,and $d$ is the distance between the slits.We know that the wavelength of red light $\lambda_{R}$ is greater than the wavelength of violet light $\lambda_{V}$ (i.e.,$\lambda_{R} > \lambda_{V}$).Since $\beta$ is directly proportional to $\lambda$ $(\beta \propto \lambda)$,it follows that $\beta_{R} > \beta_{V}$.When the light source is changed from red to violet,the fringe width decreases,which means the consecutive fringe lines will come closer together.

If the source of light used in a Young's double slit experiment is changed from red to violet:

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