Central Fringe and Transparent Medium – Rankers Physics

Young's Double Slit Experiment: Practice Problem & Solution

Assertion (A): The central fringe is bright or dark, it dependents on the initial phase difference between the two coherent sources. Reason (R): The pattern and position of fringes always remains same even after the introduction of transparent medium in a path of one of the slit.  
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Short Solution (Best for NEET):

To solve this problem, we apply the core principles of Young's Double Slit Experiment. Understanding the underlying formula is key to arriving at the correct answer below:

Assertion (A) is true. The nature of the central fringe depends on the initial phase difference. Reason (R) is false. Introducing a transparent medium causes a path difference \((n-1)t\) and shifts the entire fringe pattern.

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