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shusha [124]
3 years ago
9

Bright and dark fringes are seen on a screen when light from a single source reaches two narrow slits a short distance apart. Th

e locations of bright and dark fringes can be interchanged if a transparent plastic film is placed in front of one of the slits. The minimum thickness of this film must be?
Physics
1 answer:
Dima020 [189]3 years ago
7 0

Answer:

Explanation:

Let the thickness of the film is t and the refractive index of the material of film is n.

When light travels through a sheet of thickness t, the optical path traveled is nt.

When the path of one of slit is covered by a sheet of thickness t, the optical path becomes

x = ( n - 1) t

As the one fringe is shift, so the optical path changed by one wavelength.

i.e., x = λ

So, λ = ( n - 1) t

t=\frac{\lambda }{n-1}

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