7.The classic method used to demonstrate the essential features of interference of light was devised by
Thomas Young, namely, Young's two-slit experiment. The distance between any two consecutive
bright fringes (or dark fringes) is called fringe width. Now if the whole Young's two-slit apparatus is
immersed in water, the fringe width will
(A) increase
(B) decrease
(C) unchanged
(D) disappear.
N-uA
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