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In Young's doube slit experiment, what i...

In Young's doube slit experiment, what is the effect of following operations on interference fringes :
(i) The screen is moved away from the plane of the slits.
(ii) The monochromatic source is replaced by another monochromatic source of smaller wavelength.
(iii) The monochromatic source is replaced by a source of white light.
(iv) The width of the source slit is made wider
(v) The separation between the two slits is increased.
(vi) The distance between the source slit and the plane of the two slits is increased.
(vii) The width of each of the two slits is of the order of wavelength of light source.

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