A thin transparent sheet is placed in front of a Young's double slit.

1.	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.
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).

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.

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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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.

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.

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