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Q.

Both in interference and diffraction phenomena, alternate dark and bright fringes are obtained on screen
i) generally fringe width is same in interference and not same in diffraction
ii) the central fringe in interference has maximum brightness and the intensity gradually decreases on either side
iii) in interference the intensity of all bright fringes is same
iv) both the phenomena are produced from same coherent sources

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a

i only

b

i and ii

c

i, ii & iv

d

i, iii &iv

answer is D.

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Detailed Solution

  Fringe width is same in interference and not same in diffraction. In interference the intensity of all bright fringes is same.  Both the phenomena are produced from same coherent sources.

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Both in interference and diffraction phenomena, alternate dark and bright fringes are obtained on screeni) generally fringe width is same in interference and not same in diffractionii) the central fringe in interference has maximum brightness and the intensity gradually decreases on either sideiii) in interference the intensity of all bright fringes is sameiv) both the phenomena are produced from same coherent sources