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0 votes
13.9k views
in Physics by (138k points)
A thin transparent sheet is placed in front of a Young's double slit. The fringe-width will

(a) increase

(b) decrease

(c) remain same

(d) become nonuniform.

1 Answer

+1 vote
by (144k points)
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Best answer

(c) remain same

EXPLANATION:   

The fringe width is given as w = Dλ/d where D = distance of the screen from the slits d = distance of slits. 

The wavelength λ remains the same when the light comes out of the film. Thus none of the entity D, d or λ changes. So the fringe with will remain the same. Hence the option (c).

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