what is effect on the interference fringes in a young double slit experiment due to following
(1)screen is moved away from the plane of the slits.
(2)the monochromatic source is replaced by another monochromatic source of shorter wavelength
(3) the monochromatic source is replaced by another monochromatic source of longer wavelength
(4)slit width is increased.
(5)monochromatic light is replaced by white light.

Bandwidth:β=DdλwhereD is Distance between screen to slitsd is Distance between the slitsλ is wavelength(1)Screen is moved away --  Here, D increasesHence, bandwidth increases(2)Wavelength decreases  --  Here, λ decreasesHence, bandwidth decreases(3)Wavelength increases --  Here, λ increasesHence, bandwidth increases(4)Slitwindth increases  --  Here, d increasesHence, bandwidth decreases(e)Monochromatic is replaced with white light --  Max brightness occurs at the centre

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1.fringe width will increase.
2.decreases
3.increases
4.decreases
All the above answers are based on the formula fringe width =wavelength*distance between slits and screen/distance between slits.
5.in white light interference only central bright has max brightness as all colours have max at the centre.
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