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In Young’s double slit experiment performed using a monochromatic light of wavelength λ , when a glass plate ( μ = 1.5) of thickness x λ is introduced in the path of the one of the interfering beams, the intensity at the position where the central maximum occurred previously remains unchanged. The value of x will be:

1. 3
2. 2
3. 1.5
4. 0.5

Correct answer: 2

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