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(C) In Young's double slit experiment,the fringe width $W$ is given by the formula $W = \frac{\lambda D}{d}$,where $\lambda$ is the wavelength of ligh

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Fringewidth decreases.

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(C) In Young's double slit experiment,the fringe width $W$ is given by the formula $W = \frac{\lambda D}{d}$,where $\lambda$ is the wavelength of light,$D$ is the distance between the screen and the slits,and $d$ is the distance between the two slits.Since the wavelength of violet light $(\lambda_{violet} \approx 400 \ nm)$ is significantly smaller than the wavelength of sodium light $(\lambda_{sodium} \approx 589 \ nm)$,the fringe width $W$ will decrease when violet light is used instead of sodium light.

How is the interference pattern affected when violet light replaces sodium light?

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