IGNOU PHE 9 2016 - c) Discuss, with necessary theory, how is interference pattern in Youn

Question

c) Discuss, with necessary theory, how is interference pattern in Young’s double slit experiment modified when a thin glass plate is introduced in the path of one of the interference waves?

13 Nov 2017

Answer :

Word Count : 401

In Young's double-slit experiment, interference occurs when light waves from two coherent sources overlap. When a thin glass plate is introduced into the path of one of the interference waves, it acts as an additional optical element and modifies the interference pattern. This phenomenon is known as the interference of light waves in the presence of a thin film, and it can be explained using the theory of thin film interference.

The interference pattern is modified due to the reflection and transmission of light at both surfaces of the thin glass plate. The key factors affecting the modification are the refractive index of the glass plate, the thickness of the plate, and the wavelength of the incident light.

1. Phase Change: When light waves reflect off the upper surface of the thin glass plate, a phase change occurs if the reflecting medium (air) is less optically dense than the glass. This phase

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