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What happenes to the fringe pattern if i...

What happenes to the fringe pattern if in the path of one of the slits a glass plate which obsorbs 50% energy is interposed?

A

The bright fringes become brighter and dark fringes become darker

B

No fringes are observed

C

The fringe width decreases

D

None of the above

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The correct Answer is:
D
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What happens to the fringe pattern if in the path of one of the slits a glass plate which absorbs 50% energy is interposed?

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Determine what happens to the double slits interference pattern if one of the slits is covered with a thin, transparent film whose thickness is lambda/(2(mu-1)) , where lambda is the wavelength of the incident light and mu is the index of refraction of the film.

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A plate of thickness t made of a material of refractive index mu is placed in front of one of the slits in a double slit experiment. (a) Find the changes in he optical path due to introduction of the plate. (b) Wht should be the minimum thickness t which will make the intensity at the centre of the fringe pattern zero ? Wavelength of the light used is lamda . Neglect any absorption of light in the plate.

Assertion: The pattern and position of fringes always remain same even after the introduction of transparent medium in a path of one of the slit. Reason: The central fringe is bright or dark is depend upon the initial phase difference between the two coherence sources.

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