Young's Modulus Experiment With a Glass Screen

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The discussion centers on the impact of a glass screen on the interference pattern in a Young's modulus experiment. It highlights that the phase difference between two wave sources, S1 and S2, changes due to the longer path taken by the wave through the glass. This alteration results in a shift of the fringe pattern, moving it towards a specific direction, identified as Y. The conversation also touches on the comparison of wavelengths of light traveling through glass versus air, which is crucial for understanding the observed shifts. Overall, the experiment emphasizes the effects of medium on wave behavior in interference patterns.
Jeremy Feng
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Homework Statement


upload_2018-10-6_15-40-46.png


Homework Equations



Path difference is nλ at maxima, (n+0.5)λ at minima

The Attempt at a Solution



I think the phase difference between S1 and S2 is not 0 anymore, because the wave effectively takes a longer distance by going through S2. Thus, there is no longer a central maxima at O.

This means the whole fringe pattern shifts, however why is it towards Y?
 

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Consider the number of wavelengths of the light as it passes thru the glass
as compared to the number of wavelengths of light as it passes thru
an equivalent thickness of air.
 

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