Question

if source of light is used youngs double experiment is changed from red to voilet?what will happn to the fringe width​

Answer 1

Explanation:

Since the violet has smaller λ than the red light, so the fringe width will decrease. Hence the consecutive fringes will come closer.

Answer 2

When source of light changes from red to violet the fringe width will decrease.

We need to find what will happen to the fringe width when source of light changes from red to violet .

For this we should know the dependency of fringe width $\beta$ with the wavelength $\lambda$ .

So ,

$\beta=\dfrac{\lambda D}{d}$

So , fringe width is directly proportional to wavelength .

Now , wavelength of violet is less than wavelength of red light .

Therefore , when source of light changes from red to violet the fringe width will decrease.

Hence , this is the required solution .

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