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Question

In an ideal double-slit experiment, when a glass-plate (μ=1.5) of thickness t is introduced in the path of one the interfering beams (wavelength λ), the intensity at the position where the central maximum occurred previously remains unchanged. The minimum thickness of the glass-plate is :

A
λ
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B
λ3
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C
2λ3
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D
2λ
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Solution

The correct option is D 2λ
According to the given condition,
(μ1)t=nλ for minimum t,n=1
So, (μ1)tmin=λ
tmin=λμ1
tmin=λ1.51=2λ

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